--- src/tests/show_compiler_details.orig	2019-08-02 20:40:49 UTC
+++ src/tests/show_compiler_details
@@ -9,8 +9,12 @@ CPP=${CPP:-cpp}
 LD=${LD:-ld}
 
 # handle strange environments
-command -v gcpp >/dev/null 2>&1 && CPP=gcpp
-command -v gcc >/dev/null 2>&1 && CC=gcc
+if ! command -v $CPP; then
+	command -v gcpp && CPP=gcpp
+fi >/dev/null 2>&1
+if ! command -v $CC; then
+	command -v gcc && CC=gcc
+fi >/dev/null 2>&1
 
 echo "XXX:--------------------------------------------------"
 echo "XXX: $0: preprocessor ('$CPP') version"