try to fix build

Author: stsp

debian/rules

@@ -4,7 +4,7 @@
 	dh $@ --parallel --builddirectory=build
 
 override_dh_auto_build:
-	dh_auto_build $@ -- prefix=/usr
+	dh_auto_build $@ -- prefix=/usr CC=$(CC) CXX=$(CXX)
 
 override_dh_auto_install:
 	dh_auto_install $@ -- prefix=/usr \

fdpp/clang.mak

@@ -18,7 +18,7 @@ CLANG_VER := 16
 GCC_VER := $(shell $(CXX) --version 2>&1 | head -n 1 | grep GCC | \
   sed -E 's/.+ \(GCC\) ([^.]+)\.[^.]+\.[^ ]+.*/\1/')
 ifeq ($(GCC_VER),)
-$(error unknown compiler)
+$(error unknown compiler $(CXX) $(shell $(CXX) --version))
 endif
 endif
 FLEX = $(shell which flex 2>/dev/null)