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-rw-r--r--pkgs/os-specific/linux/wvdial/default.nix2
1 files changed, 2 insertions, 0 deletions
diff --git a/pkgs/os-specific/linux/wvdial/default.nix b/pkgs/os-specific/linux/wvdial/default.nix
index eb9d09d2a119..7decd42b376b 100644
--- a/pkgs/os-specific/linux/wvdial/default.nix
+++ b/pkgs/os-specific/linux/wvdial/default.nix
@@ -15,6 +15,8 @@ stdenv.mkDerivation rec {
     export makeFlags="prefix=$out"
     # not sure about this line
     sed -i 's@/etc/ppp/peers@$out/etc/ppp/peers@' Makefile.in
+
+    sed -e '1i#include <unistd.h>' -i $(find . -name '*.cc')
   '';
 
   meta = {