The flag is required for some C99 math functions to be declared.
---
configure | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/configure b/configure
index c628ff6..d3e8764 100755
--- a/configure
+++ b/configure
@@ -2477,6 +2477,7 @@ case $target_os in
os/2*)
ln_s="cp -f"
objformat="aout"
+ add_cppflags -D_GNU_SOURCE
add_ldflags -Zomf -Zbin-files -Zargs-wild -Zmap
SHFLAGS='$(SUBDIR)$(NAME).def -Zdll -Zomf'
FFSERVERLDFLAGS=""
--
1.7.1
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