Index: VirtualBox-5.1.2/Config.kmk
===================================================================
--- VirtualBox-5.1.2.orig/Config.kmk
+++ VirtualBox-5.1.2/Config.kmk
@@ -2542,7 +2542,7 @@ else
  # The reason for this hack is that the windows kmk_ash cannot deal with $((1+1)).
  # Some versions of gcc (e.g. openSUSE11) return only major.minor on `gcc -dumpversion`.
  VBOX_GCC_VERSION = $(shell \
-    $(1) -dumpversion | $(SED_EXT) 's|\([0-9]\)\.\([0-9]\)\.\{0,1\}\([0-9]\{0,1\}\).*|$$(int-add $$(int-mul 10000, \1), $$(int-mul 100, \2), $$(firstword \3 0))|' )
+   $(1) -dumpversion | $(SED_EXT) 's|\([0-9]\)\.\{0,1\}\([0-9]\{0,1\}\)\.\{0,1\}\([0-9]\{0,1\}\).*|$$(int-add $$(int-mul 10000, \1), $$(int-mul 100, $$(firstword \2 0)), $$(firstword \3 0))|' )
 endif
 
 # Find MinGW cross compilers for EFI on non-windows systems. We need to probe
Index: VirtualBox-5.1.2/configure
===================================================================
--- VirtualBox-5.1.2.orig/configure
+++ VirtualBox-5.1.2/configure
@@ -431,8 +431,13 @@ check_gcc()
         log_failure "cannot execute '$CXX -dumpversion'"
         fail really
       fi
-      cc_maj=`echo $cc_ver|cut -d. -f1`
-      cc_min=`echo $cc_ver|cut -d. -f2`
+      if echo $cc_ver | grep -q '\.'; then
+        cc_maj=`echo $cc_ver|cut -d. -f1`
+        cc_min=`echo $cc_ver|cut -d. -f2`
+      else
+        cc_maj=$cc_ver
+        cc_min=0
+      fi
       if [ "x$cc_ver" != "x$cxx_ver" ]; then
         log_failure "gcc version $cc_ver does not match g++ version $cxx_ver"
         fail really