--- mplayer-export-2018-03-01/configure~	2018-03-04 10:36:57.000000000 +0000
+++ mplayer-export-2018-03-01/configure	2018-03-04 10:37:44.401480707 +0000
@@ -2861,14 +2861,9 @@
   warn_cflags=yes
 fi
 
-CFLAGS="-D_ISOC99_SOURCE -I. -Iffmpeg $CFLAGS"
-HOSTCFLAGS="-D_ISOC99_SOURCE -I. -Iffmpeg -O3"
+CFLAGS="-I. -Iffmpeg $CFLAGS"
+HOSTCFLAGS="-I. -Iffmpeg -O3"
 
-# On glibc, add some more CPPFLAGS for enabling required functionality.
-cpp_condition_check features.h "defined __GLIBC__" &&
-  CFLAGS="-D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 $CFLAGS" &&
-  HOSTCFLAGS="-D_POSIX_C_SOURCE=200112 -D_XOPEN_SOURCE=600 $HOSTCFLAGS"
-
 if cygwin; then
   CFLAGS="-D_XOPEN_SOURCE=600 $CFLAGS"
 fi