docker pull elonh/opde:sdk
docker run -it --rm elonh/opde:sdk zsh # or bash
export http_proxy= # [your proxy], do not use localhost or 127.0.0.1
export https_proxy=$http_proxy
opde feeds && opde config -a
make package/feeds/packages/shairport-sync/compile -j$(nproc) || make package/feeds/packages/shairport-sync/compile V=s

Applying ./patches/010-no-cxx.patch using plaintext: 
patching file Makefile.am
patching file configure.ac
autoreconf: Entering directory `.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: /openwrt/staging_dir/host/bin/aclocal -I /openwrt/staging_dir/target-mips_24kc_musl/host/share/aclocal -I /openwrt/staging_dir/hostpkg/share/aclocal -I /openwrt/staging_dir/target-mips_24kc_musl/usr/share/aclocal -I m4 -I . --force 
autoreconf: configure.ac: tracing
autoreconf: configure.ac: not using Libtool
autoreconf: running: /openwrt/staging_dir/host/bin/autoconf --include=/openwrt/staging_dir/target-mips_24kc_musl/host/share/aclocal --include=/openwrt/staging_dir/hostpkg/share/aclocal --include=/openwrt/staging_dir/target-mips_24kc_musl/usr/share/aclocal --include=m4 --include=. --prepend-include=/openwrt/staging_dir/host/share/aclocal --force
autoreconf: running: /openwrt/staging_dir/host/bin/autoheader --include=/openwrt/staging_dir/target-mips_24kc_musl/host/share/aclocal --include=/openwrt/staging_dir/hostpkg/share/aclocal --include=/openwrt/staging_dir/target-mips_24kc_musl/usr/share/aclocal --include=m4 --include=. --prepend-include=/openwrt/staging_dir/host/share/aclocal --force
autoreconf: running: /openwrt/staging_dir/host/bin/automake --add-missing --force-missing
configure.ac:25: installing './compile'
configure.ac:6: installing './install-sh'
configure.ac:6: installing './missing'
Makefile.am: installing './INSTALL'
Makefile.am: installing './depcomp'
autoreconf: Leaving directory `.'
configure: WARNING: unrecognized options: --disable-nls
configure: loading site script /openwrt/include/site/mips
checking for a BSD-compatible install... /openwrt/staging_dir/host/bin/install -c
checking whether build environment is sane... yes
checking for mips-openwrt-linux-strip... mips-openwrt-linux-musl-strip
checking for a thread-safe mkdir -p... /usr/bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
checking whether make supports nested variables... yes
checking for mips-openwrt-linux-ranlib... mips-openwrt-linux-musl-gcc-ranlib
checking for mips-openwrt-linux-gcc... ccache_cc
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables... 
checking whether we are cross compiling... yes
checking for suffix of object files... o
checking whether we are using the GNU C compiler... yes
checking whether ccache_cc accepts -g... no
checking for ccache_cc option to accept ISO C89... none needed
checking whether ccache_cc understands -c and -o together... yes
checking for style of include used by make... GNU
checking dependency style of ccache_cc... gcc3
checking pkg-config is at least version 0.9.0... yes
checking for clock_gettime in -lrt... yes
checking for pthread_create in -lpthread... yes
checking for exp in -lm... yes
checking for popt... yes
checking for libconfig... yes
checking for alac... yes
checking for DAEMON... yes
checking for SSL... no
configure: error: Package requirements (libssl,libcrypto) were not met:

Package 'libssl', required by 'virtual:world', not found
Package 'libcrypto', required by 'virtual:world', not found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables SSL_CFLAGS
and SSL_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.
make[3]: *** [Makefile:126: /openwrt/build_dir/target-mips_24kc_musl/shairport-sync-openssl/shairport-sync-3.3.8/.configured_68b329da9893e34099c7d8ad5cb9c940] Error 1