diff --git a/sci-electronics/ghdl/ghdl-4.0.0.ebuild b/sci-electronics/ghdl/ghdl-4.0.0-r1.ebuild
similarity index 97%
rename from sci-electronics/ghdl/ghdl-4.0.0.ebuild
rename to sci-electronics/ghdl/ghdl-4.0.0-r1.ebuild
index fb194d074563d..91b707eb0ca7e 100644
--- a/sci-electronics/ghdl/ghdl-4.0.0.ebuild
+++ b/sci-electronics/ghdl/ghdl-4.0.0-r1.ebuild
@@ -3,7 +3,7 @@
 
 EAPI=8
 
-ADA_COMPAT=( gnat_2021 )
+ADA_COMPAT=( gnat_2021 gcc_13 )
 LLVM_MAX_SLOT=17        # Check "configure" script for supported LLVM versions.
 
 inherit ada edo llvm toolchain-funcs
diff --git a/sci-electronics/ghdl/ghdl-4.0.0_pre20231218.ebuild b/sci-electronics/ghdl/ghdl-4.0.0_pre20231218-r1.ebuild
similarity index 97%
rename from sci-electronics/ghdl/ghdl-4.0.0_pre20231218.ebuild
rename to sci-electronics/ghdl/ghdl-4.0.0_pre20231218-r1.ebuild
index 068afb77b62db..423768c69164e 100644
--- a/sci-electronics/ghdl/ghdl-4.0.0_pre20231218.ebuild
+++ b/sci-electronics/ghdl/ghdl-4.0.0_pre20231218-r1.ebuild
@@ -5,7 +5,7 @@ EAPI=8
 
 [[ "${PV}" = *_pre20231218 ]] && COMMIT=2135cbf1458bd1b8b8f42bda81222ab57bd66de6
 
-ADA_COMPAT=( gnat_2021 )
+ADA_COMPAT=( gnat_2021 gcc_13 )
 LLVM_MAX_SLOT=17        # Check "configure" script for supported LLVM versions.
 
 inherit ada edo llvm toolchain-funcs