debian/changelog

+t-coffee (12.00.7fb08c2-4) unstable; urgency=medium
+
+  [ Helmut Grohne ]
+  * Fix FTCBFS: Pass C++ compiler as CC.
+    Closes: #922196
+
+ -- Andreas Tille <tille@debian.org>  Fri, 15 Feb 2019 07:43:22 +0100
+
 t-coffee (12.00.7fb08c2-3) unstable; urgency=medium
 
   * Do not use -i flag to ignore build failures

debian/rules

@@ -11,7 +11,7 @@ export DEB_BUILD_MAINT_OPTIONS = hardening=+all
 	dh $@ --sourcedirectory=t_coffee_source
 
 override_dh_auto_build:
-	dh_auto_build -- USER_BIN=../bin/ FCC="$(FCC)" all
+	dh_auto_build -- USER_BIN=../bin/ FCC="$(FCC)" 'CC=$$(CXX)' all
 
 override_dh_auto_clean:
 	rm -rf t_coffee_source/*.o t_coffee_source/t_coffee bin/t_coffee $(shell find example/ -size 0) bin/t_coffee