diff -Nru mingw-w64-7.0.0/debian/changelog mingw-w64-7.0.0/debian/changelog
--- mingw-w64-7.0.0/debian/changelog	2019-11-11 22:13:04.000000000 +0000
+++ mingw-w64-7.0.0/debian/changelog	2019-11-15 21:53:07.000000000 +0000
@@ -1,3 +1,12 @@
+mingw-w64 (7.0.0-2) unstable; urgency=medium
+
+  * Avoid erroring out in the build on CPUs which aren’t used on Windows;
+    instead, require that the target be specified when widl is used on
+    such systems. This allows building the package on architectures other
+    than x86, ARM and PowerPC.
+
+ -- Stephen Kitt <skitt@debian.org>  Fri, 15 Nov 2019 22:53:07 +0100
+
 mingw-w64 (7.0.0-1) unstable; urgency=medium
 
   * New upstream release.
diff -Nru mingw-w64-7.0.0/debian/patches/series mingw-w64-7.0.0/debian/patches/series
--- mingw-w64-7.0.0/debian/patches/series	2018-11-11 17:39:17.000000000 +0000
+++ mingw-w64-7.0.0/debian/patches/series	2019-11-14 22:04:15.000000000 +0000
@@ -9,3 +9,4 @@
 genlib-lm.patch
 widl-pathtools-bsd.patch
 widl-windef-aarch64.patch
+widl-cpu.patch
diff -Nru mingw-w64-7.0.0/debian/patches/widl-cpu.patch mingw-w64-7.0.0/debian/patches/widl-cpu.patch
--- mingw-w64-7.0.0/debian/patches/widl-cpu.patch	1970-01-01 00:00:00.000000000 +0000
+++ mingw-w64-7.0.0/debian/patches/widl-cpu.patch	2019-11-15 21:51:21.000000000 +0000
@@ -0,0 +1,46 @@
+Description: Don’t error out on non-Windows CPUs
+Author: Stephen Kitt <skitt@debian.org>
+
+--- a/mingw-w64-tools/widl/src/widl.c
++++ b/mingw-w64-tools/widl/src/widl.c
+@@ -103,7 +103,7 @@
+ #elif defined(__aarch64__)
+ enum target_cpu target_cpu = CPU_ARM64;
+ #else
+-#error Unsupported CPU
++enum target_cpu target_cpu = CPU_UNKNOWN;
+ #endif
+ 
+ int debuglevel = DEBUGLEVEL_NONE;
+@@ -758,13 +758,17 @@
+       if (pointer_size == 4) target_cpu = CPU_x86;
+       else pointer_size = 8;
+       break;
++  case CPU_ARM:
++  case CPU_POWERPC:
++      if (pointer_size == 8) error( "Cannot build 64-bit code for this CPU\n" );
++      pointer_size = 4;
++      break;
+   case CPU_ARM64:
+       if (pointer_size == 4) error( "Cannot build 32-bit code for this CPU\n" );
+       pointer_size = 8;
+       break;
+   default:
+-      if (pointer_size == 8) error( "Cannot build 64-bit code for this CPU\n" );
+-      pointer_size = 4;
++      error("Undetermined target, please specify one\n");
+       break;
+   }
+ 
+--- a/mingw-w64-tools/widl/src/widl.h
++++ b/mingw-w64-tools/widl/src/widl.h
+@@ -76,7 +76,8 @@
+ 
+ enum target_cpu
+ {
+-    CPU_x86, CPU_x86_64, CPU_POWERPC, CPU_ARM, CPU_ARM64, CPU_LAST = CPU_ARM64
++    CPU_x86, CPU_x86_64, CPU_POWERPC, CPU_ARM, CPU_ARM64, CPU_LAST = CPU_ARM64,
++    CPU_UNKNOWN
+ };
+ 
+ extern enum target_cpu target_cpu;