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What happens if I push all of nixpkgs
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Nix
12345678910111213141516171819202122232425262728293031323334353637383940{lib, stdenv, fetchurl, jre} :
stdenv.mkDerivation rec { pname = "jflex"; version = "1.9.1";
src = fetchurl { url = "http://jflex.de/release/jflex-${version}.tar.gz"; sha256 = "sha256-4MHp7vkf9t8E1z+l6v8T86ArZ5/uFHTlzK4AciTfbfY="; };
sourceRoot = "${pname}-${version}";
installPhase = '' runHook preInstall mkdir -p $out cp -a * $out rm -f $out/bin/jflex.bat
patchShebangs $out sed -i -e '/^JAVA=java/ s#java#${jre}/bin/java#' $out/bin/jflex runHook postInstall '';
doInstallCheck = true; installCheckPhase = '' runHook preInstallCheck $out/bin/jflex --version runHook postInstallCheck '';
meta = { homepage = "https://www.jflex.de/"; description = "Lexical analyzer generator for Java, written in Java"; mainProgram = "jflex"; license = lib.licenses.bsd3; platforms = lib.platforms.unix; };}