1 files changed, 1 insertions, 1 deletions
diff --git a/configure b/configure
index af340423..6ef68942 100755
--- a/configure
+++ b/configure
@@ -128,7 +128,7 @@ yacc_given=${yacc+y}
 yacc=${yacc-'$(cross)$(tool_prefix)$(yaccname)'}
 nm=${nm-'$(cross)$(tool_prefix)nm'}
 opt_flags=${opt_flags--O2}
-lang_flags=${lang_flags--ansi -D_POSIX_C_SOURCE=2}
+lang_flags=${lang_flags--ansi -D_XOPEN_SOURCE}
 diag_flags=${diag_flags--Wall -Wmissing-prototypes -Wstrict-prototypes}
 debug_flags=${debug_flags--g}
 inline=${inline-}