diff -Nru libhat-trie-0.0~git25f9e946/debian/changelog libhat-trie-0.0~git25f9e946/debian/changelog
--- libhat-trie-0.0~git25f9e946/debian/changelog	2016-06-22 23:33:12.000000000 +0000
+++ libhat-trie-0.0~git25f9e946/debian/changelog	2016-08-29 18:23:43.000000000 +0000
@@ -1,3 +1,11 @@
+libhat-trie (0.0~git25f9e946-2) unstable; urgency=medium
+
+  * Make build reproducible.
+    - make sure CFLAGS does not get overwritten, dropping
+      -fdebug-prefix-map.
+
+ -- Sascha Steinbiss <satta@debian.org>  Mon, 29 Aug 2016 18:23:43 +0000
+
 libhat-trie (0.0~git25f9e946-1) unstable; urgency=medium
 
   * Initial release. (Closes: #827937)
diff -Nru libhat-trie-0.0~git25f9e946/debian/patches/reproducible.patch libhat-trie-0.0~git25f9e946/debian/patches/reproducible.patch
--- libhat-trie-0.0~git25f9e946/debian/patches/reproducible.patch	1970-01-01 00:00:00.000000000 +0000
+++ libhat-trie-0.0~git25f9e946/debian/patches/reproducible.patch	2016-08-29 18:23:43.000000000 +0000
@@ -0,0 +1,13 @@
+Description: make build reproducible
+Author: Sascha Steinbiss <sascha@steinbiss.name>
+--- a/configure.ac
++++ b/configure.ac
+@@ -4,7 +4,7 @@
+ m4_ifdef([AM_SILENT_RULES],[AM_SILENT_RULES([yes])])
+ AC_CONFIG_MACRO_DIR([m4])
+ 
+-base_CFLAGS="-std=c99 -Wall -Wextra -pedantic"
++base_CFLAGS="${CFLAGS} -std=c99 -Wall -Wextra -pedantic"
+ opt_CFLAGS="${base_CFLAGS} -O3"
+ dbg_CFLAGS="${base_CFLAGS} -g -O0"
+ 
diff -Nru libhat-trie-0.0~git25f9e946/debian/patches/series libhat-trie-0.0~git25f9e946/debian/patches/series
--- libhat-trie-0.0~git25f9e946/debian/patches/series	1970-01-01 00:00:00.000000000 +0000
+++ libhat-trie-0.0~git25f9e946/debian/patches/series	2016-08-29 18:23:43.000000000 +0000
@@ -0,0 +1 @@
+reproducible.patch