gsl: drop a breaking ldflag

math/gsl/Portfile

@@ -44,6 +44,11 @@ configure.checks.implicit_function_declaration.whitelist-append \
                     finite \
                     strchr
 
+# Version 2.8 added -Wl,-no_fixup_chains flag,
+# which is not universally supported. Drop it.
+# Related: https://github.com/haskell/zlib/issues/53
+patchfiles-append   patch-fix-linking.diff
+
 test.run            yes
 test.target         check
 

math/gsl/files/patch-fix-linking.diff

@@ -0,0 +1,19 @@
+The linker may not understand this flag:
+ld: unknown option: -no_fixup_chains
+collect2: error: ld returned 1 exit status
+
+--- configure	2024-05-25 21:26:49.000000000 +0800
++++ configure	2024-05-30 14:02:19.000000000 +0800
+@@ -8761,10 +8761,11 @@
+       _lt_dar_allow_undefined='$wl-flat_namespace $wl-undefined ${wl}suppress' ;;
+     darwin*)
+       case $MACOSX_DEPLOYMENT_TARGET,$host in
++        # This is correct, later PowerPC uses -undefined dynamic_lookup
+         10.[012],*|,*powerpc*-darwin[5-8]*)
+           _lt_dar_allow_undefined='$wl-flat_namespace $wl-undefined ${wl}suppress' ;;
+         *)
+-          _lt_dar_allow_undefined='$wl-undefined ${wl}dynamic_lookup $wl-no_fixup_chains' ;;
++          _lt_dar_allow_undefined='$wl-undefined ${wl}dynamic_lookup' ;;
+       esac
+     ;;
+   esac