Description:
The mplayer build system doesn't support global CFLAGS and LDFLAGS environment variables.
This, however, doesn't mean that they should be ignored completely.

The following small change honours the custom flags set in /etc/makepkg.conf while still keeping the build system happy:

diff --git a/PKGBUILD b/PKGBUILD
index 115e95e..12d0667 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -20,13 +20,18 @@ md5sums=('b783223d0a175cb1d2f5bcdc99d2f781'
'd00874ccc644b7f43d6ef1c942fcef28')

build() {
- # Custom CFLAGS break the mplayer build
+ # Global CFLAGS and LDFLAGS break the mplayer build
+ _cflags="${CFLAGS//-O?}"
+ _cflags="${_cflags//-pipe}"
+ _ldflags="$LDFLAGS"
unset CFLAGS LDFLAGS

cd ${srcdir}/${pkgname}

./configure --prefix=/usr \
--enable-runtime-cpudetection \
+ --extra-cflags="$_cflags" \
+ --extra-ldflags="$_ldflags" \
--disable-gui \
--disable-arts \
--disable-liblzo \


Additional info:
I looked at version 32663-1 of the the PKGBUILD.

Steps to reproduce:
Compile mplayer with custom CFLAGS or LDFLAGS set in /etc/makepkg.conf