diff --git a/dev-libs/apr/apr-1.5.2.recipe b/dev-libs/apr/apr-1.5.2.recipe
index f56272a90..c61e72aa0 100644
--- a/dev-libs/apr/apr-1.5.2.recipe
+++ b/dev-libs/apr/apr-1.5.2.recipe
@@ -36,7 +36,7 @@ BUILD()
 	aclocal -I build
 	autoconf
 	runConfigure ./configure \
-		--with-installbuilddir=$prefix/data/apr
+		--with-installbuilddir=$prefix/data/apr CFLAGS=-D_BSD_SOURCE
 
 	# TODO: fix this hack (by finding out why top_builddir seems to be unset)!
 	ln -sfn $sourceDir/libtool /libtool