Index: ps/trunk/libraries/osx/build-osx-libs.sh
===================================================================
--- ps/trunk/libraries/osx/build-osx-libs.sh	(revision 24996)
+++ ps/trunk/libraries/osx/build-osx-libs.sh	(revision 24997)
@@ -1,975 +1,975 @@
 #!/bin/bash
 #
 # Script for acquiring and building OS X dependencies for 0 A.D.
 #
 # The script checks whether a source tarball exists for each
 # dependency, if not it will download the correct version from
 # the project's website, then it removes previous build files,
 # extracts the tarball, configures and builds the lib. The script
 # should die on any errors to ease troubleshooting.
 #
 # make install is used to copy the compiled libs to each specific
 # directory and also the config tools (e.g. sdl-config). Because
 # of this, OS X developers must run this script at least once,
 # to configure the correct lib directories. It must be run again
 # if the libraries are moved.
 #
 # Building against an SDK is an option, though not required,
 # as not all build environments contain the Developer SDKs
 # (Xcode does, but the Command Line Tools package does not)
 #
 # --------------------------------------------------------------
 # Library versions for ease of updating:
 ZLIB_VERSION="zlib-1.2.11"
 CURL_VERSION="curl-7.71.0"
 ICONV_VERSION="libiconv-1.16"
 XML2_VERSION="libxml2-2.9.10"
 SDL2_VERSION="SDL2-2.0.12"
 # NOTE: remember to also update LIB_URL below when changing version
 BOOST_VERSION="boost_1_74_0"
 # NOTE: remember to also update LIB_URL below when changing version
 WXWIDGETS_VERSION="wxWidgets-3.0.5.1"
 # libpng was included as part of X11 but that's removed from Mountain Lion
 # (also the Snow Leopard version was ancient 1.2)
 PNG_VERSION="libpng-1.6.36"
 OGG_VERSION="libogg-1.3.3"
 VORBIS_VERSION="libvorbis-1.3.7"
 # gloox requires GnuTLS, GnuTLS requires Nettle and GMP
 GMP_VERSION="gmp-6.2.0"
 NETTLE_VERSION="nettle-3.6"
 # NOTE: remember to also update LIB_URL below when changing version
 GLOOX_VERSION="gloox-1.0.24"
 GNUTLS_VERSION="gnutls-3.6.15"
 # OS X only includes part of ICU, and only the dylib
 # NOTE: remember to also update LIB_URL below when changing version
 ICU_VERSION="icu4c-67_1"
 ENET_VERSION="enet-1.3.17"
-MINIUPNPC_VERSION="miniupnpc-2.1"
+MINIUPNPC_VERSION="miniupnpc-2.2.2"
 SODIUM_VERSION="libsodium-1.0.18"
 FMT_VERSION="7.1.3"
 # --------------------------------------------------------------
 # Bundled with the game:
 # * SpiderMonkey
 # * NVTT
 # * FCollada
 
 # Provided by OS X:
 # * OpenAL
 # * OpenGL
 # --------------------------------------------------------------
 
 export CC=${CC:="clang"} CXX=${CXX:="clang++"}
 export MIN_OSX_VERSION=${MIN_OSX_VERSION:="10.12"}
 
 # The various libs offer inconsistent configure options, some allow
 # setting sysroot and OS X-specific options, others don't. Adding to
 # the confusion, Apple moved /Developer/SDKs into the Xcode app bundle
 # so the path can't be guessed by clever build tools (like Boost.Build).
 # Sometimes configure gets it wrong anyway, especially on cross compiles.
 # This is why we prefer using (OBJ)CFLAGS, (OBJ)CXXFLAGS, and LDFLAGS.
 
 # Check if SYSROOT is set and not empty
 if [[ $SYSROOT && ${SYSROOT-_} ]]; then
   C_FLAGS="-isysroot $SYSROOT"
   LDFLAGS="$LDFLAGS -Wl,-syslibroot,$SYSROOT"
 fi
 # Check if MIN_OSX_VERSION is set and not empty
 if [[ $MIN_OSX_VERSION && ${MIN_OSX_VERSION-_} ]]; then
   C_FLAGS="$C_FLAGS -mmacosx-version-min=$MIN_OSX_VERSION"
   # clang and llvm-gcc look at mmacosx-version-min to determine link target
   # and CRT version, and use it to set the macosx_version_min linker flag
   LDFLAGS="$LDFLAGS -mmacosx-version-min=$MIN_OSX_VERSION"
 fi
 
 CFLAGS="$CFLAGS $C_FLAGS -fvisibility=hidden"
 CXXFLAGS="$CXXFLAGS $C_FLAGS -stdlib=libc++ -std=c++17 -msse4.1"
 OBJCFLAGS="$OBJCFLAGS $C_FLAGS"
 OBJCXXFLAGS="$OBJCXXFLAGS $C_FLAGS"
 
 LDFLAGS="$LDFLAGS -stdlib=libc++"
 
 JOBS=${JOBS:="-j2"}
 
 set -e
 
 die()
 {
   echo ERROR: $*
   exit 1
 }
 
 download_lib()
 {
   local url=$1
   local filename=$2
 
   if [ ! -e $filename ]; then
     echo "Downloading $filename"
     curl -fLo ${filename} ${url}${filename} || die "Download of $url$filename failed"
   fi
 }
 
 already_built()
 {
   echo -e "Skipping - already built (use --force-rebuild to override)"
 }
 
 # Check that we're actually on OS X
 if [ "`uname -s`" != "Darwin" ]; then
   die "This script is intended for OS X only"
 fi
 
 # Parse command-line options:
 force_rebuild=false
 
 for i in "$@"
 do
   case $i in
     --force-rebuild ) force_rebuild=true;;
     -j* ) JOBS=$i ;;
   esac
 done
 
 cd "$(dirname $0)"
 # Now in libraries/osx/ (where we assume this script resides)
 
 # --------------------------------------------------------------
 echo -e "Building zlib..."
 
 LIB_VERSION="${ZLIB_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.gz"
 LIB_DIRECTORY=$LIB_VERSION
 LIB_URL="http://zlib.net/"
 
 mkdir -p zlib
 pushd zlib > /dev/null
 
 ZLIB_DIR="$(pwd)"
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY include lib share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   # patch zlib's configure script to use our CFLAGS and LDFLAGS
   (patch -Np0 -i ../../patches/zlib_flags.diff \
     && CFLAGS="$CFLAGS" LDFLAGS="$LDFLAGS" \
       ./configure --prefix="$ZLIB_DIR" \
          --static \
     && make ${JOBS} && make install) || die "zlib build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building libcurl..."
 
 LIB_VERSION="${CURL_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.bz2"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="http://curl.haxx.se/download/"
 
 mkdir -p libcurl
 pushd libcurl > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   (./configure CFLAGS="$CFLAGS" \
       LDFLAGS="$LDFLAGS" \
       --prefix="$INSTALL_DIR" \
       --enable-ipv6 \
       --with-darwinssl \
       --without-gssapi \
       --without-libmetalink \
       --without-libpsl \
       --without-librtmp \
       --without-libssh2 \
       --without-nghttp2 \
       --without-nss \
       --without-polarssl \
       --without-ssl \
       --without-gnutls \
       --without-brotli \
       --without-cyassl \
       --without-winssl \
       --without-mbedtls \
       --without-wolfssl \
       --without-spnego \
       --disable-ares \
       --disable-ldap \
       --disable-ldaps \
       --without-libidn2 \
       --with-zlib="${ZLIB_DIR}" \
       --enable-shared=no \
     && make ${JOBS} && make install) || die "libcurl build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building libiconv..."
 
 LIB_VERSION="${ICONV_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.gz"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="http://ftp.gnu.org/pub/gnu/libiconv/"
 
 mkdir -p iconv
 pushd iconv > /dev/null
 
 ICONV_DIR="$(pwd)"
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   (./configure CFLAGS="$CFLAGS" \
       LDFLAGS="$LDFLAGS" \
       --prefix="$ICONV_DIR" \
       --without-libiconv-prefix \
       --without-libintl-prefix \
       --disable-nls \
       --enable-shared=no \
     && make ${JOBS} && make install) || die "libiconv build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building libxml2..."
 
 LIB_VERSION="${XML2_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.gz"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="ftp://xmlsoft.org/libxml2/"
 
 mkdir -p libxml2
 pushd libxml2 > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   (./configure CFLAGS="$CFLAGS" \
       LDFLAGS="$LDFLAGS" \
       --prefix="$INSTALL_DIR" \
       --without-lzma \
       --without-python \
       --with-iconv="${ICONV_DIR}" \
       --with-zlib="${ZLIB_DIR}" \
       --enable-shared=no \
     && make ${JOBS} && make install) || die "libxml2 build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 
 echo -e "Building SDL2..."
 
 LIB_VERSION="${SDL2_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.gz"
 LIB_DIRECTORY=$LIB_VERSION
 LIB_URL="https://libsdl.org/release/"
 
 mkdir -p sdl2
 pushd sdl2 > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   # We don't want SDL2 to pull in system iconv, force it to detect ours with flags.
   # Don't use X11 - we don't need it and Mountain Lion removed it
   (./configure CPPFLAGS="-I${ICONV_DIR}/include" \
       CFLAGS="$CFLAGS" \
       CXXFLAGS="$CXXFLAGS" \
       LDFLAGS="$LDFLAGS -L${ICONV_DIR}/lib" \
       --prefix="$INSTALL_DIR" \
       --disable-video-x11 \
       --without-x \
       --enable-video-cocoa \
       --enable-shared=no \
     && make $JOBS && make install) || die "SDL2 build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building Boost..."
 
 LIB_VERSION="${BOOST_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.bz2"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="https://dl.bintray.com/boostorg/release/1.74.0/source/"
 
 mkdir -p boost
 pushd boost > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY include lib
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   # Can't use macosx-version, see above comment.
   (./bootstrap.sh --with-libraries=filesystem,system \
       --prefix=$INSTALL_DIR \
     && ./b2 cflags="$CFLAGS" \
           toolset=clang \
           cxxflags="$CXXFLAGS" \
           linkflags="$LDFLAGS" ${JOBS} \
           -d2 \
           --layout=system \
           --debug-configuration \
           link=static \
           threading=multi \
           variant=release install \
     ) || die "Boost build failed"
 
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 # TODO: This build takes ages, anything we can exclude?
 echo -e "Building wxWidgets..."
 
 LIB_VERSION="${WXWIDGETS_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.bz2"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="http://github.com/wxWidgets/wxWidgets/releases/download/v3.0.5.1/"
 
 mkdir -p wxwidgets
 pushd wxwidgets > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   mkdir -p build-release
   pushd build-release
 
   CONF_OPTS="--prefix=$INSTALL_DIR
     --disable-shared
     --enable-unicode
     --with-cocoa
     --with-opengl
     --with-libiconv-prefix=${ICONV_DIR}
     --with-expat=builtin
     --with-libpng=builtin
     --without-libtiff
     --without-sdl
     --without-x
     --disable-stc
     --disable-webview
     --disable-webkit
     --disable-webviewwebkit
     --disable-webviewie
     --without-libjpeg"
   # wxWidgets configure now defaults to targeting 10.5, if not specified,
   # but that conflicts with our flags
   if [[ $MIN_OSX_VERSION && ${MIN_OSX_VERSION-_} ]]; then
     CONF_OPTS="$CONF_OPTS --with-macosx-version-min=$MIN_OSX_VERSION"
   fi
   (../configure CFLAGS="$CFLAGS" \
       CXXFLAGS="$CXXFLAGS" \
       CPPFLAGS="-stdlib=libc++ -D__ASSERT_MACROS_DEFINE_VERSIONS_WITHOUT_UNDERSCORES=1" \
       LDFLAGS="$LDFLAGS" $CONF_OPTS \
     && make ${JOBS} && make install) || die "wxWidgets build failed"
   popd
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building libpng..."
 
 LIB_VERSION="${PNG_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.gz"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="http://download.sourceforge.net/libpng/"
 
 mkdir -p libpng
 pushd libpng > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   # libpng has no flags for zlib but the 10.12 version is too old, so link our own.
   (./configure CFLAGS="$CFLAGS" CPPFLAGS=" -I $ZLIB_DIR/include "\
       LDFLAGS="$LDFLAGS -L$ZLIB_DIR/lib" \
       --prefix=$INSTALL_DIR \
       --enable-shared=no \
     && make ${JOBS} && make install) || die "libpng build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building libogg..."
 
 LIB_VERSION="${OGG_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.gz"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="http://downloads.xiph.org/releases/ogg/"
 
 # Dependency of vorbis
 # we can install them in the same directory for convenience
 mkdir -p libogg
 mkdir -p vorbis
 
 pushd libogg > /dev/null
 OGG_DIR="$(pwd)"
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY include lib share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   (./configure CFLAGS="$CFLAGS" \
       LDFLAGS="$LDFLAGS" \
       --prefix=$OGG_DIR \
       --enable-shared=no \
     && make ${JOBS} && make install) || die "libogg build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building libvorbis..."
 
 LIB_VERSION="${VORBIS_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.gz"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="http://downloads.xiph.org/releases/vorbis/"
 
 pushd vorbis > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY include lib share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   (./configure CFLAGS="$CFLAGS" \
       LDFLAGS="$LDFLAGS" \
       --prefix="$INSTALL_DIR" \
       --enable-shared=no \
       --with-ogg="$OGG_DIR" \
     && make ${JOBS} && make install) || die "libvorbis build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building GMP..."
 
 LIB_VERSION="${GMP_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.bz2"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="https://gmplib.org/download/gmp/"
 
 mkdir -p gmp
 pushd gmp > /dev/null
 
 GMP_DIR="$(pwd)"
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   # NOTE: enable-fat in this case allows building and running on different CPUS.
   # Otherwise CPU-specific instructions will be used with no fallback for older CPUs.
   (./configure CFLAGS="$CFLAGS" \
       CXXFLAGS="$CXXFLAGS" \
       LDFLAGS="$LDFLAGS" \
       --prefix="$INSTALL_DIR" \
       --enable-fat \
       --disable-shared \
       --with-pic \
     && make ${JOBS} && make install) || die "GMP build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building Nettle..."
 
 LIB_VERSION="${NETTLE_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.gz"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="https://ftp.gnu.org/gnu/nettle/"
 
 mkdir -p nettle
 pushd nettle > /dev/null
 
 NETTLE_DIR="$(pwd)"
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   # NOTE: enable-fat in this case allows building and running on different CPUS.
   # Otherwise CPU-specific instructions will be used with no fallback for older CPUs.
   (./configure CFLAGS="$CFLAGS" \
       CXXFLAGS="$CXXFLAGS" \
       LDFLAGS="$LDFLAGS" \
       --with-include-path="${GMP_DIR}/include" \
       --with-lib-path="${GMP_DIR}/lib" \
       --prefix="$INSTALL_DIR" \
       --enable-fat \
       --disable-shared \
       --disable-documentation \
       --disable-openssl \
       --disable-assembler \
     && make ${JOBS} && make install) || die "Nettle build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building GnuTLS..."
 
 LIB_VERSION="${GNUTLS_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.xz"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="https://www.gnupg.org/ftp/gcrypt/gnutls/v3.6/"
 
 mkdir -p gnutls
 pushd gnutls > /dev/null
 
 GNUTLS_DIR="$(pwd)"
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   # Patch GNUTLS for a linking issue with isdigit
   # Patch by Ross Nicholson: https://gitlab.com/gnutls/gnutls/-/issues/1033#note_379529145
   (patch -Np1 -i ../../patches/03-undo-libtasn1-cisdigit.patch \
     && ./configure CFLAGS="$CFLAGS" \
           CXXFLAGS="$CXXFLAGS" \
           LDFLAGS="$LDFLAGS" \
           LIBS="-L${GMP_DIR}/lib -lgmp" \
           NETTLE_CFLAGS="-I${NETTLE_DIR}/include" \
           NETTLE_LIBS="-L${NETTLE_DIR}/lib -lnettle" \
           HOGWEED_CFLAGS="-I${NETTLE_DIR}/include" \
           HOGWEED_LIBS="-L${NETTLE_DIR}/lib -lhogweed" \
           GMP_CFLAGS="-I${GMP_DIR}/include" \
           GMP_LIBS="-L${GMP_DIR}/lib -lgmp" \
           --prefix="$INSTALL_DIR" \
           --enable-shared=no \
           --without-idn \
           --with-included-unistring \
           --with-included-libtasn1 \
           --without-p11-kit \
           --disable-tests \
           --disable-guile \
           --disable-doc \
           --disable-tools \
           --disable-nls \
     && make ${JOBS} LDFLAGS= install) || die "GnuTLS build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building gloox..."
 
 LIB_VERSION="${GLOOX_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.bz2"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="http://camaya.net/download/"
 
 mkdir -p gloox
 pushd gloox > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   # TODO: pulls in libresolv dependency from /usr/lib
   (./configure CFLAGS="$CFLAGS" \
       CXXFLAGS="$CXXFLAGS" \
       LDFLAGS="$LDFLAGS" \
       --prefix="$INSTALL_DIR" \
       GNUTLS_CFLAGS="-I${GNUTLS_DIR}/include" \
       GNUTLS_LIBS="-L${GNUTLS_DIR}/lib -lgnutls" \
       --enable-shared=no \
       --with-zlib="${ZLIB_DIR}" \
       --without-libidn \
       --with-gnutls="yes" \
       --without-openssl \
       --without-tests \
       --without-examples \
       --disable-getaddrinfo \
     && make ${JOBS} && make install) || die "gloox build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building ICU..."
 
 LIB_VERSION="${ICU_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION-src.tgz"
 LIB_DIRECTORY="icu"
 LIB_URL="https://github.com/unicode-org/icu/releases/download/release-67-1/"
 
 mkdir -p $LIB_DIRECTORY
 pushd icu > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib sbin share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   mkdir -p source/build
   pushd source/build
 
   (CFLAGS="$CFLAGS" CXXFLAGS="$CXXFLAGS" LDFLAGS="$LDFLAGS" \
     ../runConfigureICU MacOSX \
         --prefix=$INSTALL_DIR \
         --disable-shared \
         --enable-static \
         --disable-samples \
         --enable-extras \
         --enable-icuio \
         --enable-tools \
     && make ${JOBS} && make install) || die "ICU build failed"
   popd
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building ENet..."
 
 LIB_VERSION="${ENET_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.gz"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="http://enet.bespin.org/download/"
 
 mkdir -p enet
 pushd enet > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib sbin share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   (./configure CFLAGS="$CFLAGS" \
       LDFLAGS="$LDFLAGS" \
       --prefix=${INSTALL_DIR} \
       --enable-shared=no \
     && make clean && make ${JOBS} && make install) || die "ENet build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building MiniUPnPc..."
 
 LIB_VERSION="${MINIUPNPC_VERSION}"
 LIB_ARCHIVE="$LIB_VERSION.tar.gz"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="http://miniupnp.tuxfamily.org/files/download.php?file="
 
 mkdir -p miniupnpc
 pushd miniupnpc > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY bin include lib share
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   (make clean \
     && CFLAGS=$CFLAGS LDFLAGS=$LDFLAGS make ${JOBS} \
     && INSTALLPREFIX="$INSTALL_DIR" make install \
   ) || die "MiniUPnPc build failed"
   popd
   # TODO: how can we not build the dylibs?
   rm -f lib/*.dylib
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building libsodium..."
 
 LIB_VERSION="${SODIUM_VERSION}"
 LIB_ARCHIVE="$SODIUM_VERSION.tar.gz"
 LIB_DIRECTORY="$LIB_VERSION"
 LIB_URL="https://download.libsodium.org/libsodium/releases/"
 
 mkdir -p libsodium
 pushd libsodium > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$LIB_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
 
   rm -f .already-built
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY include lib
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   (./configure CFLAGS="$CFLAGS" \
       LDFLAGS="$LDFLAGS" \
       --prefix=${INSTALL_DIR} \
       --enable-shared=no \
     && make clean \
     && CFLAGS=$CFLAGS LDFLAGS=$LDFLAGS make ${JOBS} \
     && make check \
     && INSTALLPREFIX="$INSTALL_DIR" make install \
   ) || die "libsodium build failed"
   popd
   echo "$LIB_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------
 echo -e "Building fmt..."
 
 LIB_DIRECTORY="fmt-$FMT_VERSION"
 LIB_ARCHIVE="$FMT_VERSION.tar.gz"
 LIB_URL="https://github.com/fmtlib/fmt/archive/"
 
 mkdir -p fmt
 pushd fmt > /dev/null
 
 if [[ "$force_rebuild" = "true" ]] || [[ ! -e .already-built ]] || [[ "$(<.already-built)" != "$FMT_VERSION" ]]
 then
   INSTALL_DIR="$(pwd)"
   rm -f .already-built
 
   download_lib $LIB_URL $LIB_ARCHIVE
 
   rm -rf $LIB_DIRECTORY include lib
   tar -xf $LIB_ARCHIVE
   pushd $LIB_DIRECTORY
 
   # It appears that older versions of Clang require constexpr statements to have a user-set constructor.
   patch -Np1 -i ../../patches/fmt_constexpr.diff
 
   mkdir -p build
   pushd build
 
   (cmake .. \
       -DFMT_TEST=False \
       -DFMT_DOC=False \
       -DCMAKE_INSTALL_PREFIX="$INSTALL_DIR" \
     && make fmt ${JOBS} && make install) || die "fmt build failed"
 
   popd
   popd
   echo "$FMT_VERSION" > .already-built
 else
   already_built
 fi
 popd > /dev/null
 
 # --------------------------------------------------------------------
 # The following libraries are shared on different OSes and may
 # be customized, so we build and install them from bundled sources
 # --------------------------------------------------------------------
 # SpiderMonkey - bundled, no download
 pushd ../source/spidermonkey/ > /dev/null
 
 if [[ "$force_rebuild" = "true" ]]
 then
   rm -f .already-built
 fi
 
 # Use the regular build script for SM.
 JOBS="$JOBS" ZLIB_DIR="$ZLIB_DIR" ./build.sh || die "Error building spidermonkey"
 
 popd > /dev/null
 
 # --------------------------------------------------------------
 # NVTT - bundled, no download
 pushd ../source/nvtt > /dev/null
 
 if [[ "$force_rebuild" = "true" ]]
 then
   rm -f .already-built
 fi
 
 CXXFLAGS="$CXXFLAGS" CFLAGS="$CFLAGS" LDFLAGS="$LDFLAGS" JOBS="$JOBS" ./build.sh || die "Error building NVTT"
 
 popd > /dev/null
 
 # --------------------------------------------------------------
 # FCollada - bundled, no download
 pushd ../source/fcollada/ > /dev/null
 
 if [[ "$force_rebuild" = "true" ]]
 then
   rm -f .already-built
 fi
 
 CXXFLAGS="$CXXFLAGS" CFLAGS="$CFLAGS" LDFLAGS="$LDFLAGS" JOBS="$JOBS" ./build.sh || die "Error building FCollada"
 
 popd > /dev/null