diff --git a/ocaml.changes b/ocaml.changes
index 3699adf..c2e38de 100644
--- a/ocaml.changes
+++ b/ocaml.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Mar  3 03:03:03 UTC 2025 - ohering@suse.de
+
+- Use gcc7 in SLE12 because dune 3.17 requires a gcc which recognizes
+  -fdiagnostics-color=always (dune#11509)
+
 -------------------------------------------------------------------
 Fri Feb  7 07:07:07 UTC 2025 - ohering@suse.de
 
diff --git a/ocaml.spec b/ocaml.spec
index f8488e6..99f9544 100644
--- a/ocaml.spec
+++ b/ocaml.spec
@@ -66,7 +66,13 @@ Requires:       ocaml(runtime) = %version-%release
 Obsoletes:      ocaml-docs
 Provides:       ocaml(compiler) = %ocaml_base_version
 Provides:       ocaml(ocaml_base_version) = %ocaml_base_version
+%if 0%{?suse_version} > 1315
 Requires:       gcc
+%else
+BuildRequires:  gcc7
+Requires:       gcc7
+Requires:       gcc7-c++
+%endif
 Provides:       ocaml(ocaml.opt) = %ocaml_base_version
 Obsoletes:      ocaml-seq < %version-%release
 Obsoletes:      ocaml-seq-debuginfo < %version-%release
@@ -151,7 +157,11 @@ applications that use Ocaml.
 
 %build
 echo %version > VERSION
+%if 0%{?suse_version} > 1315
 export CC='gcc'
+%else
+export CC='/usr/bin/gcc-7'
+%endif
 export AS='as'
 export ASPP="$CC -c"
 configure_target=