diff --git a/_config b/_config
index 356a36e..d619626 100644
--- a/_config
+++ b/_config
@@ -1072,6 +1072,7 @@ Ignore: postgresql13-devel-mini:this-is-only-for-build-envs
 Ignore: postgresql14-devel-mini:this-is-only-for-build-envs
 Ignore: postgresql15-devel-mini:this-is-only-for-build-envs
 Ignore: postgresql16-devel-mini:this-is-only-for-build-envs
+Ignore: postgresql17-devel-mini:this-is-only-for-build-envs
 Ignore: systemd-mini-container:this-is-only-for-build-envs
 Ignore: systemd-mini:this-is-only-for-build-envs
 Ignore: udev-mini:this-is-only-for-build-envs
@@ -4064,6 +4065,11 @@ BuildFlags: onlybuild:rpmlint-mini-AGGR
 %endif
 %endif
 
+# required for postgresql17 (SR#347979)
+Prefer: postgresql17-devel-mini
+Prefer: -clang15-devel
+Prefer: -llvm15-devel
+
 %ifarch i586
 BuildFlags: onlybuild:aaa_base
 BuildFlags: onlybuild:acl