References:
https://bugzilla.mozilla.org/show_bug.cgi?id=513422

diff --git a/xpcom/glue/SSE.h b/xpcom/glue/SSE.h
--- a/xpcom/glue/SSE.h
+++ b/xpcom/glue/SSE.h
@@ -234,32 +234,73 @@
 #endif
 #ifdef __SSE4_2__
   // It's ok to use SSE4.2 instructions based on the -march option.
   #define MOZILLA_PRESUME_SSE4_2 1
 #endif
 
 #if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
 
-// cpuid.h is available on gcc 4.3 and higher on i386 and x86_64
-#include <cpuid.h>
 #define MOZILLA_SSE_HAVE_CPUID_DETECTION
 
 namespace mozilla {
 
   namespace sse_private {
 
     enum CPUIDRegister { eax = 0, ebx = 1, ecx = 2, edx = 3 };
 
+    inline void my__cpuid(unsigned int* regs, unsigned int level)
+    {
+      regs[0] = level;
+#     if defined(__i386__)
+      __asm__ __volatile__(
+        "pushl %%ebx"             "\n\t"
+        "movl  %0, %%edi"         "\n\t"
+        "movl  0(%%edi), %%eax"   "\n\t"
+        "cpuid"                   "\n\t"
+        "movl  %%eax, 0(%%edi)"   "\n\t"
+        "movl  %%ebx, 4(%%edi)"   "\n\t"
+        "movl  %%ecx, 8(%%edi)"   "\n\t"
+        "movl  %%edx, 12(%%edi)"  "\n\t"
+        "popl  %%ebx"             "\n"
+        : /*out*/
+        : /*in*/"r"(regs)
+        : /*trash*/"edi","eax","ecx","edx","memory","cc"
+      );
+#     elif defined(__x86_64__)
+      __asm__ __volatile__(
+        "pushq %%rbx"             "\n\t"
+        "movq  %0, %%rdi"         "\n\t"
+        "movl  0(%%rdi), %%eax"   "\n\t"
+        "cpuid"                   "\n\t"
+        "movl  %%eax, 0(%%rdi)"   "\n\t"
+        "movl  %%ebx, 4(%%rdi)"   "\n\t"
+        "movl  %%ecx, 8(%%rdi)"   "\n\t"
+        "movl  %%edx, 12(%%rdi)"  "\n\t"
+        "popq  %%rbx"             "\n"
+        : /*out*/
+        : /*in*/"r"(regs)
+        : /*trash*/"rdi","rax","rcx","rdx","memory","cc"
+      );
+#     else
+#       error "Hmm, unsupported x86-esque platform"
+#     endif
+    }
+
     inline bool
     has_cpuid_bit(unsigned int level, CPUIDRegister reg, unsigned int bit)
     {
+      // Check that the level in question is supported.
       unsigned int regs[4];
-      return __get_cpuid(level, &regs[0], &regs[1], &regs[2], &regs[3]) &&
-             (regs[reg] & bit);
+      my__cpuid(regs, level & 0x80000000u);
+      if (unsigned(regs[0]) < level)
+        return false;
+
+      my__cpuid(regs, level);
+      return !!(unsigned(regs[reg]) & bit);
     }
 
   }
 
 }
 
 #endif