master isn't cross-compiling on ubuntu 15.10

[gazsiazasz]

$ ./autogen.sh autoreconf: Entering directory .' autoreconf: configure.ac: not using Gettext autoreconf: running: aclocal --force -I m4 autoreconf: configure.ac: tracing autoreconf: running: libtoolize --copy --force libtoolize: putting auxiliary files in.'. libtoolize: copying file ./ltmain.sh' libtoolize: putting macros in AC_CONFIG_MACRO_DIR,m4'. libtoolize: copying file m4/libtool.m4' libtoolize: copying filem4/ltoptions.m4' libtoolize: copying file m4/ltsugar.m4' libtoolize: copying filem4/ltversion.m4' libtoolize: copying file m4/lt~obsolete.m4' autoreconf: running: /usr/bin/autoconf --force autoreconf: running: /usr/bin/autoheader --force autoreconf: running: automake --add-missing --copy --force-missing autoreconf: Leaving directory.'

$ ./configure --host=$HOST --build=$BUILD checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for arm-linux-gnueabi-strip... arm-linux-gnueabi-strip checking for a thread-safe mkdir -p... /bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking whether make supports nested variables... yes checking for arm-linux-gnueabi-gcc... arm-linux-gnueabi-gcc 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 arm-linux-gnueabi-gcc accepts -g... yes checking for arm-linux-gnueabi-gcc option to accept ISO C89... none needed checking whether arm-linux-gnueabi-gcc understands -c and -o together... yes checking for style of include used by make... GNU checking dependency style of arm-linux-gnueabi-gcc... gcc3 checking build system type... x86_64-pc-linux-gnu checking host system type... arm-unknown-linux-gnueabi checking how to print strings... printf checking for a sed that does not truncate output... /bin/sed checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for fgrep... /bin/grep -F checking for ld used by arm-linux-gnueabi-gcc... /usr/arm-linux-gnueabi/bin/ld checking if the linker (/usr/arm-linux-gnueabi/bin/ld) is GNU ld... yes checking for BSD- or MS-compatible name lister (nm)... /usr/bin/arm-linux-gnueabi-nm -B checking the name lister (/usr/bin/arm-linux-gnueabi-nm -B) interface... BSD nm checking whether ln -s works... yes checking the maximum length of command line arguments... 1572864 checking whether the shell understands some XSI constructs... yes checking whether the shell understands "+="... yes checking how to convert x86_64-pc-linux-gnu file names to arm-unknown-linux-gnueabi format... func_convert_file_noop checking how to convert x86_64-pc-linux-gnu file names to toolchain format... func_convert_file_noop checking for /usr/arm-linux-gnueabi/bin/ld option to reload object files... -r checking for arm-linux-gnueabi-objdump... objdump checking how to recognize dependent libraries... pass_all checking for arm-linux-gnueabi-dlltool... dlltool checking how to associate runtime and link libraries... printf %s\n checking for arm-linux-gnueabi-ar... arm-linux-gnueabi-ar checking for archiver @FILE support... @ checking for arm-linux-gnueabi-strip... (cached) arm-linux-gnueabi-strip checking for arm-linux-gnueabi-ranlib... arm-linux-gnueabi-ranlib checking command to parse /usr/bin/arm-linux-gnueabi-nm -B output from arm-linux-gnueabi-gcc object... ok checking for sysroot... no checking for arm-linux-gnueabi-mt... no checking for mt... mt configure: WARNING: using cross tools not prefixed with host triplet checking if mt is a manifest tool... no checking how to run the C preprocessor... arm-linux-gnueabi-gcc -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking for dlfcn.h... yes checking for objdir... .libs checking if arm-linux-gnueabi-gcc supports -fno-rtti -fno-exceptions... no checking for arm-linux-gnueabi-gcc option to produce PIC... -fPIC -DPIC checking if arm-linux-gnueabi-gcc PIC flag -fPIC -DPIC works... yes checking if arm-linux-gnueabi-gcc static flag -static works... yes checking if arm-linux-gnueabi-gcc supports -c -o file.o... yes checking if arm-linux-gnueabi-gcc supports -c -o file.o... (cached) yes checking whether the arm-linux-gnueabi-gcc linker (/usr/arm-linux-gnueabi/bin/ld) supports shared libraries... yes checking whether -lc should be explicitly linked in... no checking dynamic linker characteristics... GNU/Linux ld.so checking how to hardcode library paths into programs... immediate checking whether stripping libraries is possible... yes checking if libtool supports shared libraries... yes checking whether to build shared libraries... yes checking whether to build static libraries... yes checking for library containing dlopen... -ldl checking for dlerror... yes checking for shl_load... no checking for shl_load in -ldld... no checking for dld_link in -ldld... no checking for cos in -lm... yes checking for ANSI C header files... (cached) yes checking for connect in -lsocket... no checking for pthread_create in -lpthread... yes checking for native Win32... no checking for arm-linux-gnueabi-pkg-config... /usr/bin/arm-linux-gnueabi-pkg-config checking pkg-config is at least version 0.9.0... yes checking for libao... no checking that generated files are newer than configure... done configure: creating ./config.status config.status: creating Makefile config.status: creating include/Makefile config.status: creating src/Makefile config.status: creating src/lib/Makefile config.status: creating src/lib/alac/Makefile config.status: creating src/lib/crypto/Makefile config.status: creating config.h config.status: config.h is unchanged config.status: executing depfiles commands config.status: executing libtool commands

$ echo $HOST; echo $BUILD arm-linux-gnueabi x86_64-linux-gnu

It does not find the libao, even if it is installed.. If I am not cross-compiling, then everything works fine, and the executable is built.