debian/changelog

+insighttoolkit4 (4.13.2-dfsg1-6) unstable; urgency=medium
+
+  * d/rules: Fix extra flags
+
+ -- Gert Wollny <gewo@debian.org>  Sat, 07 Dec 2019 13:58:49 +0100
+
 insighttoolkit4 (4.13.2-dfsg1-5) unstable; urgency=medium
 
   * d/rules: Reduce debug info because the build is too big

debian/rules

@@ -9,7 +9,7 @@ SOVERSION = $(VER_MAJOR).$(VER_MINOR)
 export DEB_LDFLAGS_MAINT_APPEND = -Wl,--as-needed
 
 #ITK is not properly using system provided headers
-export DEB_CPPFLAGS_MAINT_APPEND = "-I/usr/include/nifti -g1"
+export DEB_CPPFLAGS_MAINT_APPEND = -I/usr/include/nifti -g1
 
 ENABLE_PYTHON=1