diff --git a/pkgs/applications/gis/grass/clang-integer-conversion.patch b/pkgs/applications/gis/grass/clang-integer-conversion.patch
deleted file mode 100644
index 85145f45c37d..000000000000
--- a/pkgs/applications/gis/grass/clang-integer-conversion.patch
+++ /dev/null
@@ -1,21 +0,0 @@
-diff -ur a/db/drivers/mysql/db.c b/db/drivers/mysql/db.c
---- a/db/drivers/mysql/db.c	1969-12-31 19:00:01.000000000 -0500
-+++ b/db/drivers/mysql/db.c	2023-11-09 23:26:25.329700495 -0500
-@@ -52,9 +52,16 @@
- 
-         db_get_login2("mysql", name, &user, &password, &host, &port);
- 
-+        const char* errstr;
-+        unsigned int port_number = (unsigned int)strtonum(port, 0, 65536, &errstr);
-+        if (errstr != NULL) {
-+            db_d_append_error("%s", errstr);
-+            return DB_FAILED;
-+        }
-+
-         connection = mysql_init(NULL);
-         res = mysql_real_connect(connection, host, user, password,
--                                 connpar.dbname, port, NULL, 0);
-+                                 connpar.dbname, port_number, NULL, 0);
- 
-         if (res == NULL) {
-             db_d_append_error("%s\n%s", _("Connection failed."),
diff --git a/pkgs/applications/gis/grass/default.nix b/pkgs/applications/gis/grass/default.nix
index fd26e49fdbd8..2e02c1d2da6a 100644
--- a/pkgs/applications/gis/grass/default.nix
+++ b/pkgs/applications/gis/grass/default.nix
@@ -5,7 +5,7 @@
 , makeWrapper
 , wrapGAppsHook3
 
-, withOpenGL ? true
+, withOpenGL ? !stdenv.isDarwin
 
 , bison
 , blas
@@ -23,6 +23,7 @@
 , libsvm
 , libtiff
 , libxml2
+, llvmPackages
 , netcdf
 , pdal
 , pkg-config
@@ -86,15 +87,11 @@ stdenv.mkDerivation (finalAttrs: {
     zlib
     zstd
   ] ++ lib.optionals withOpenGL [ libGLU ]
-  ++ lib.optionals stdenv.isDarwin [ libiconv ];
+  ++ lib.optionals stdenv.isDarwin [ libiconv ]
+  ++ lib.optionals stdenv.cc.isClang [ llvmPackages.openmp ];
 
   strictDeps = true;
 
-  patches = lib.optionals stdenv.isDarwin [
-    # Fix conversion of const char* to unsigned int.
-    ./clang-integer-conversion.patch
-  ];
-
   configureFlags = [
     "--with-blas"
     "--with-cairo-ldflags=-lfontconfig"