{ stdenv, fetchurl, bison, m4 }: stdenv.mkDerivation rec { name = "flex-2.6.1"; src = fetchurl { url = "https://github.com/westes/flex/releases/download/v2.6.1/flex-2.6.1.tar.gz"; sha256 = "0fy14c35yz2m1n1m4f02by3501fn0cca37zn7jp8lpp4b3kgjhrw"; }; buildInputs = [ bison ]; propagatedBuildInputs = [ m4 ]; postConfigure = stdenv.lib.optionalString (stdenv.isDarwin || stdenv.isCygwin) '' sed -i Makefile -e 's/-no-undefined//;' ''; crossAttrs = { # disable tests which can't run on build machine postPatch = '' substituteInPlace Makefile.in --replace "tests" " "; ''; preConfigure = '' export ac_cv_func_malloc_0_nonnull=yes export ac_cv_func_realloc_0_nonnull=yes ''; }; meta = { homepage = https://github.com/westes/flex; description = "A fast lexical analyser generator"; platforms = stdenv.lib.platforms.unix; }; }