libvpx: Add VP9 decoder.

source/libvpx/build/make/configure.sh

 #!/bin/bash
 ##
 ##  configure.sh
 ##
 ##  This script is sourced by the main configure script and contains
 ##  utility functions and other common bits that aren't strictly libvpx
 ##  related.
 ##
 ##  This build system is based in part on the FFmpeg configure script.
 ##
@@ skipping 259 matching lines @@
 TMP_ASM="${TMPDIRx}/vpx-conf-$$-${RANDOM}.asm"
 
 clean_temp_files() {
     rm -f ${TMP_C} ${TMP_H} ${TMP_O} ${TMP_X} ${TMP_ASM}
 }
 
 #
 # Toolchain Check Functions
 #
 check_cmd() {
+    enabled external_build && return
     log "$@"
     "$@" >>${logfile} 2>&1
 }
 
 check_cc() {
     log check_cc "$@"
     cat >${TMP_C}
     log_file ${TMP_C}
     check_cmd ${CC} ${CFLAGS} "$@" -c -o ${TMP_O} ${TMP_C}
 }
@@ skipping 138 matching lines @@
 ARFLAGS = -rus\$(if \$(quiet),c,v)
 LDFLAGS = ${LDFLAGS}
 ASFLAGS = ${ASFLAGS}
 extralibs = ${extralibs}
 AS_SFX    = ${AS_SFX:-.asm}
 EXE_SFX   = ${EXE_SFX}
 RTCD_OPTIONS = ${RTCD_OPTIONS}
 EOF
 
     if enabled rvct; then cat >> $1 << EOF
-fmt_deps = sed -e 's;^__image.axf;\$(dir \$@)\$(notdir \$<).o \$@;' #hide
+fmt_deps = sed -e 's;^__image.axf;\$\${@:.d=.o} \$\$@;' #hide
 EOF
     else cat >> $1 << EOF
-fmt_deps = sed -e 's;^\([a-zA-Z0-9_]*\)\.o;\$(dir \$@)\1\$(suffix \$<).o \$@;'
+fmt_deps = sed -e 's;^\([a-zA-Z0-9_]*\)\.o;\$\${@:.d=.o} \$\$@;'
 EOF
     fi
 
     print_config_mk ARCH   "${1}" ${ARCH_LIST}
     print_config_mk HAVE   "${1}" ${HAVE_LIST}
     print_config_mk CONFIG "${1}" ${CONFIG_LIST}
     print_config_mk HAVE   "${1}" gnu_strip
 
     enabled msvs && echo "CONFIG_VS_VERSION=${vs_version}" >> "${1}"
 
@@ skipping 716 matching lines @@
         mips*)
             if enabled dspr2; then
                 if enabled big_endian; then
                     echo "dspr2 optimizations are available only for little endian platforms"
                     disable dspr2
                 fi
             fi
         ;;
     esac
 
-    # for sysconf(3) and friends.
-    check_header unistd.h
-
     # glibc needs these
     if enabled linux; then
         add_cflags -D_LARGEFILE_SOURCE
         add_cflags -D_FILE_OFFSET_BITS=64
     fi
 
     # append any user defined extra cflags
     if [ -n "${extra_cflags}" ] ; then
         check_add_cflags ${extra_cflags} || \
         die "Requested extra CFLAGS '${extra_cflags}' not supported by compiler"
@@ skipping 76 matching lines @@
     # Prepare the PWD for building.
     for f in ${OOT_INSTALLS}; do
             install -D ${source_path}/$f $f
     done
     fi
     cp ${source_path}/build/make/Makefile .
 
     clean_temp_files
     true
 }