Commit d31915e9dc for ffmpeg

commit d31915e9dce4d33676fadc6c3e08965b4acc132b
Author: Ruonan <yu_ruonan@outlook.com>
Date:   Tue Oct 27 01:57:07 2026 +0800

    configure: use pkg-config for libmp3lame when available

    LAME 3.101 adds pkg-config support, generating and installing lame.pc.
    Its autotools build also replaces the bundled mpglib decoder with
    external libmpg123. Static libmp3lame builds with decoding support
    therefore require additional libraries when linking.

    The existing check links only against libmp3lame and libm, ignoring
    pkg-config metadata and failing with undefined mpg123_* references.

    Try pkg-config first to obtain the compiler and linker flags, honoring
    the configured pkg-config flags for static dependencies. Keep the
    existing library check as a fallback for older LAME releases and other
    installations without usable pkg-config metadata.

    Signed-off-by: Ruonan <yu_ruonan@outlook.com>

diff --git a/configure b/configure
index 083bd652c4..6fb518795d 100755
--- a/configure
+++ b/configure
@@ -7304,7 +7304,8 @@ if enabled libmfx; then
 fi

 enabled libmodplug        && require_pkg_config libmodplug libmodplug libmodplug/modplug.h ModPlug_Load
-enabled libmp3lame        && require "libmp3lame >= 3.98.3" lame/lame.h lame_set_VBR_quality -lmp3lame $libm_extralibs
+enabled libmp3lame        && { check_pkg_config libmp3lame "lame >= 3.98.3" lame/lame.h lame_set_VBR_quality ||
+                               require "libmp3lame >= 3.98.3" lame/lame.h lame_set_VBR_quality -lmp3lame $libm_extralibs; }
 enabled libmpeghdec       && require_pkg_config libmpeghdec "mpeghdec >= 3.0.0" mpeghdec/mpeghdecoder.h mpeghdecoder_init
 enabled libmysofa         && { check_pkg_config libmysofa libmysofa mysofa.h mysofa_neighborhood_init_withstepdefine ||
                                require libmysofa mysofa.h mysofa_neighborhood_init_withstepdefine -lmysofa $zlib_extralibs; }