diff -Nru graphicsmagick-1.3.26/debian/changelog graphicsmagick-1.3.26/debian/changelog
--- graphicsmagick-1.3.26/debian/changelog	2017-08-07 19:25:42.000000000 +0000
+++ graphicsmagick-1.3.26/debian/changelog	2017-08-17 20:19:15.000000000 +0000
@@ -1,3 +1,9 @@
+graphicsmagick (1.3.26-5+rpi1) buster-staging; urgency=medium
+
+  * Build with gcc 7 explicitly.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Thu, 17 Aug 2017 20:19:15 +0000
+
 graphicsmagick (1.3.26-5) unstable; urgency=medium
 
   * Handle mangling change for conversion operators in GCC 7 (closes: #871306).
diff -Nru graphicsmagick-1.3.26/debian/control graphicsmagick-1.3.26/debian/control
--- graphicsmagick-1.3.26/debian/control	2017-08-07 19:25:42.000000000 +0000
+++ graphicsmagick-1.3.26/debian/control	2017-08-17 20:19:15.000000000 +0000
@@ -2,7 +2,7 @@
 Section: graphics
 Priority: optional
 Maintainer: Laszlo Boszormenyi (GCS) <gcs@debian.org>
-Build-Depends: debhelper (>= 10), g++ (>= 4:7), libjpeg-dev, liblcms2-dev, libwmf-dev (>= 0.2.8.4), libx11-dev, libsm-dev, libice-dev, libxext-dev, x11proto-core-dev, libxml2-dev, libfreetype6-dev, libexif-dev, libbz2-dev, libtiff-dev, libjbig-dev, zlib1g-dev | libz-dev, libpng-dev, libwebp-dev, perl (>= 5.20), ghostscript, gsfonts, transfig, sharutils, libltdl-dev
+Build-Depends: debhelper (>= 10), g++-7, gcc-7, libjpeg-dev, liblcms2-dev, libwmf-dev (>= 0.2.8.4), libx11-dev, libsm-dev, libice-dev, libxext-dev, x11proto-core-dev, libxml2-dev, libfreetype6-dev, libexif-dev, libbz2-dev, libtiff-dev, libjbig-dev, zlib1g-dev | libz-dev, libpng-dev, libwebp-dev, perl (>= 5.20), ghostscript, gsfonts, transfig, sharutils, libltdl-dev
 Standards-Version: 4.0.0
 Homepage: http://www.graphicsmagick.org/
 
diff -Nru graphicsmagick-1.3.26/debian/rules graphicsmagick-1.3.26/debian/rules
--- graphicsmagick-1.3.26/debian/rules	2017-08-07 19:25:42.000000000 +0000
+++ graphicsmagick-1.3.26/debian/rules	2017-08-17 20:18:37.000000000 +0000
@@ -4,6 +4,9 @@
 # Uncomment this to turn on verbose mode.
 #export DH_VERBOSE=1
 
+export CC=gcc-7
+export CXX=g++-7
+
 export DEB_BUILD_ARCH ?= $(shell dpkg-architecture -qDEB_BUILD_ARCH)
 export DEB_HOST_ARCH ?= $(shell dpkg-architecture -qDEB_HOST_ARCH)
 export DEB_HOST_ARCH_OS ?= $(shell dpkg-architecture -qDEB_HOST_ARCH_OS)