diff -Nru unifrac-tools-1.2/debian/changelog unifrac-tools-1.2/debian/changelog
--- unifrac-tools-1.2/debian/changelog	2023-01-05 16:39:46.000000000 +0000
+++ unifrac-tools-1.2/debian/changelog	2023-01-09 07:31:31.000000000 +0000
@@ -1,3 +1,11 @@
+unifrac-tools (1.2-2) unstable; urgency=medium
+
+  * Sneak in CFLAGS via CPPFLAGS to work around missing support of CLFAGS
+    in upstream Makefile
+    Closes: #1028051
+
+ -- Andreas Tille <tille@debian.org>  Mon, 09 Jan 2023 08:31:31 +0100
+
 unifrac-tools (1.2-1) unstable; urgency=medium
 
   [ Andreas Tille ]
diff -Nru unifrac-tools-1.2/debian/rules unifrac-tools-1.2/debian/rules
--- unifrac-tools-1.2/debian/rules	2023-01-05 16:27:49.000000000 +0000
+++ unifrac-tools-1.2/debian/rules	2023-01-09 07:31:31.000000000 +0000
@@ -4,7 +4,7 @@
 export DEB_BUILD_MAINT_OPTIONS=hardening=+all
 export PYBUILD_NAME=unifrac
 
-export DEB_BUILD_MAINT_OPTIONS=hardening=+all
+export CPPFLAGS := $(CFLAGS) $(CPPFLAGS)
 
 %:
 	dh $@ --no-parallel