--- seamonkey-2.11/comm-release/mozilla/mfbt/double-conversion/utils.h
+++ seamonkey-2.11/comm-release/mozilla/mfbt/double-conversion/utils.h
@@ -54,6 +54,7 @@
 // On Linux,x86 89255e-22 != Div_double(89255.0/1e22)
 #if defined(_M_X64) || defined(__x86_64__) || \
     defined(__ARMEL__) || \
+    defined(PPC) || \
     defined(_MIPS_ARCH_MIPS32R2)
 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
 #elif defined(_M_IX86) || defined(__i386__)