diff -up firefox-54.0/toolkit/crashreporter/google-breakpad/src/third_party/curl/curlbuild.h.ppc-curl firefox-54.0/toolkit/crashreporter/google-breakpad/src/third_party/curl/curlbuild.h
--- firefox-54.0/toolkit/crashreporter/google-breakpad/src/third_party/curl/curlbuild.h.ppc-curl	2017-06-09 23:31:15.186207877 +0200
+++ firefox-54.0/toolkit/crashreporter/google-breakpad/src/third_party/curl/curlbuild.h	2017-06-10 00:21:26.731117206 +0200
@@ -155,7 +155,8 @@
 
 /* The size of `long', as computed by sizeof. */
 #if defined(_M_X64) || (defined(__x86_64__) && !defined(__ILP32__)) ||      \
-    defined(__aarch64__) || (defined(__mips__) && _MIPS_SIM == _ABI64)
+    defined(__aarch64__) || (defined(__mips__) && _MIPS_SIM == _ABI64) || \
+    defined(__PPC64__) || defined(__pcc64le__) || defined(__S390X__) || defined(__s390x__)
 #define CURL_SIZEOF_LONG 8
 #else
 #define CURL_SIZEOF_LONG 4