Resolve gap-system/gap#5761

PackageInfo.g

@@ -112,11 +112,20 @@ Dependencies := rec(
 
 AvailabilityTest := function()
   local dir, str;
-  dir := DirectoriesPackagePrograms("curlInterface");
-  if Filename(dir, "curl.so") = fail then
-    str := "kernel extension not compiled, package cannot be loaded";
-    LogPackageLoadingMessage(PACKAGE_WARNING, str);
-    return fail;
+  if CompareVersionNumbers(GAPInfo.Version, "4.12") then
+    if not IsKernelExtensionAvailable("curlinterface") then
+      LogPackageLoadingMessage(PACKAGE_WARNING,
+                              ["the kernel module is not compiled, ",
+                               "the package cannot be loaded."]);
+      return fail;
+    fi;
+  else
+    dir := DirectoriesPackagePrograms("curlInterface");
+    if Filename(dir, "curl.so") = fail then
+      str := "kernel extension not compiled, package cannot be loaded";
+      LogPackageLoadingMessage(PACKAGE_WARNING, str);
+      return fail;
+    fi;
   fi;
   return true;
 end,

init.g

@@ -3,11 +3,19 @@
 #
 # Reading the declaration part of the package.
 #
-_PATH_SO:=Filename(DirectoriesPackagePrograms("curlInterface"), "curl.so");
-if _PATH_SO <> fail then
-    LoadDynamicModule(_PATH_SO);
+
+if CompareVersionNumbers(GAPInfo.Version, "4.12") then
+  if not LoadKernelExtension("curlinterface") then
+    Error("failed to load the curlinterface package kernel extension");
+  fi;
+else
+  # TODO this clause can be removed once the package requires GAP>=4.12.1
+  _PATH_SO:=Filename(DirectoriesPackagePrograms("curlInterface"), "curl.so");
+  if _PATH_SO <> fail then
+      LoadDynamicModule(_PATH_SO);
+  fi;
+  Unbind(_PATH_SO);
 fi;
-Unbind(_PATH_SO);
 
 # work around a bug in some PackageManager versions, see
 # <https://github.com/gap-packages/PackageManager/pull/100>.