librdf_rasqal: remove pcre

Upstream declared the fallback to `regex.h` sufficient for functionality [1].

Fedora also disabled pcre for rasqal back in 2023 [2].

[1] https://github.com/dajobe/rasqal/issues/12#issuecomment-1713075496
[2] https://src.fedoraproject.org/rpms/rasqal/c/89316c895ce79ce3441686eb45f9a8b3943b0933?branch=rawhide

pkgs/development/libraries/librdf/rasqal.nix

@@ -5,17 +5,17 @@
   librdf_raptor2,
   gmp,
   pkg-config,
-  pcre,
   libxml2,
   perl,
+  testers,
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "rasqal";
   version = "0.9.33";
 
   src = fetchurl {
-    url = "http://download.librdf.org/source/rasqal-${version}.tar.gz";
+    url = "http://download.librdf.org/source/rasqal-${finalAttrs.version}.tar.gz";
     sha256 = "0z6rrwn4jsagvarg8d5zf0j352kjgi33py39jqd29gbhcnncj939";
   };
 
@@ -23,18 +23,28 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     gmp
-    pcre
     libxml2
   ];
 
   propagatedBuildInputs = [ librdf_raptor2 ];
 
+  confiugureFlags = [
+    # uses 'regex.h' as a fallback, which is preferrable
+    "--disable-pcre"
+  ];
+
   postInstall = "rm -rvf $out/share/gtk-doc";
 
   nativeCheckInputs = [ perl ];
   doCheck = false; # fails with "No testsuite plan file sparql-query-plan.ttl could be created in build/..."
   doInstallCheck = false; # fails with "rasqal-config does not support (--help|--version)"
 
+  passthru.tests = {
+    # rasqal-config --version just checks the pkg-config module.
+    # That check is broken, checking the pkg-config ourselves is a good replacement.
+    pkg-config = testers.testMetaPkgConfig finalAttrs.finalPackage;
+  };
+
   meta = {
     description = "Library that handles Resource Description Framework (RDF)";
     homepage = "https://librdf.org/rasqal";
@@ -44,5 +54,6 @@ stdenv.mkDerivation rec {
     ];
     maintainers = with lib.maintainers; [ marcweber ];
     platforms = lib.platforms.unix;
+    pkgConfigModules = [ "rasqal" ];
   };
-}
+})