diff -Nru gprolog-1.4.5/debian/changelog gprolog-1.4.5/debian/changelog
--- gprolog-1.4.5/debian/changelog	2016-12-11 00:16:43.000000000 +0000
+++ gprolog-1.4.5/debian/changelog	2017-02-05 10:30:08.000000000 +0000
@@ -1,3 +1,11 @@
+gprolog (1.4.5-4.1) unstable; urgency=medium
+
+  * Non-maintainer upload.
+  * Build with gcc 6 on i386, workaround the FTBFS by using
+    --disable-regs on i386. (Closes: #852008)
+
+ -- Adrian Bunk <bunk@debian.org>  Sun, 05 Feb 2017 12:30:08 +0200
+
 gprolog (1.4.5-4) unstable; urgency=medium
 
   * lintian-motivated fixes:
diff -Nru gprolog-1.4.5/debian/control gprolog-1.4.5/debian/control
--- gprolog-1.4.5/debian/control	2016-12-08 13:13:30.000000000 +0000
+++ gprolog-1.4.5/debian/control	2017-02-05 10:30:08.000000000 +0000
@@ -2,8 +2,7 @@
 Section: devel
 Priority: optional
 Maintainer: Salvador Abreu <spa@debian.org>
-Build-Depends: debhelper (>= 9), autoconf (>= 2.52), gcc (>> 5)
- [!i386], gcc-5 [i386], autotools-dev
+Build-Depends: debhelper (>= 9), autoconf (>= 2.52), autotools-dev
 Build-Depends-Indep: imagemagick, gsfonts, texlive-latex-recommended,
  texlive-latex-extra, texlive-font-utils, hevea (>= 1.09)
 Standards-Version: 3.9.8
diff -Nru gprolog-1.4.5/debian/rules gprolog-1.4.5/debian/rules
--- gprolog-1.4.5/debian/rules	2016-12-09 16:25:20.000000000 +0000
+++ gprolog-1.4.5/debian/rules	2017-02-05 10:30:08.000000000 +0000
@@ -27,6 +27,12 @@
 BCFLAGS=-funsigned-char
 export LDFLAGS=-no-pie
 
+REGS = --enable-regs
+# FTBFS workaround (#852008)
+ifneq ($(filter $(DEB_TARGET_ARCH), i386),)
+  REGS = --disable-regs
+endif
+
 # =============================================================================
 
 CPPFLAGS = \
@@ -43,7 +49,7 @@
 	--with-examples-dir=$(DOCDIR)/examples				\
 	--without-links							\
 	--disable-ebp							\
-	--enable-regs							\
+	$(REGS)								\
 	--with-c-flags="$(DBGFLAGS) $(BCFLAGS) -Wall $(CPPFLAGS)"
 
 
@@ -63,12 +69,7 @@
 SRCXPATH := $(shell echo $(SRCXPATH) | tr -d ' ')
 PATH = $(SRCXPATH):/usr/bin:/bin
 PL_PATH = ${CURDIR}/src
-
-ifeq ($(DEB_TARGET_ARCH),i386)
-	CC = gcc-5
-else
-	CC = gcc
-endif
+CC = gcc
 
 # == build binaries and documentation =========================================