diff --git a/configure b/configure
index d4757bad..9c9fe3ef 100755
--- a/configure
+++ b/configure
@@ -3304,6 +3304,8 @@ case "$host_os" in
   ;;
   solaris* ) CFLAGS="$CFLAGS -D__EXTENSIONS__"  # for strdup() from <string.h>
   ;;
+  darwin* ) CFLAGS="$CFLAGS -D_DARWIN_C_SOURCE"  # for strlcpy() from <string.h>
+  ;;
 esac
 
 # always use ./libtool unless override from commandline (libtool=mylibtool)
diff --git a/configure.ac b/configure.ac
index 2ca944d2..ef6b6a37 100755
--- a/configure.ac
+++ b/configure.ac
@@ -49,6 +49,8 @@ case "$host_os" in
   ;;
   solaris* ) CFLAGS="$CFLAGS -D__EXTENSIONS__"  # for strdup() from <string.h>
   ;;
+  darwin* ) CFLAGS="$CFLAGS -D_DARWIN_C_SOURCE"  # for strlcpy() from <string.h>
+  ;;
 esac
 
 # always use ./libtool unless override from commandline (libtool=mylibtool)