diff --git a/Shared/All.h b/Shared/All.h
index f428e8c..0073475 100644
--- a/Shared/All.h
+++ b/Shared/All.h
@@ -112,6 +112,15 @@ Global compiler settings (useful for porting)
         #define ENABLE_SSE_ASSEMBLY
         #define ENABLE_AVX_ASSEMBLY
     #endif
+#elif (defined(__GNUC__) || defined(__clang__))
+    #if defined(__i386__)
+        #define ENABLE_MMX_ASSEMBLY
+    #endif
+
+    #if defined(__i386__) || defined(__x86_64__)
+        #define ENABLE_SSE_ASSEMBLY
+        #define ENABLE_AVX_ASSEMBLY
+    #endif
 #endif
 
 // APE_BACKWARDS_COMPATIBILITY is only needed for decoding APE 3.92 or earlier files.  It
diff --git a/Source/Shared/GlobalFunctions.cpp b/Source/Shared/GlobalFunctions.cpp
index 5491cc6..d1777e4 100644
--- a/Source/Shared/GlobalFunctions.cpp
+++ b/Source/Shared/GlobalFunctions.cpp
@@ -8,6 +8,9 @@
 #ifdef PLATFORM_ANDROID
     #include <android/api-level.h>
 #endif
+#if (defined(__GNUC__) || defined(__clang__))
+    #include <cpuid.h>
+#endif
 
 namespace APE
 {
@@ -118,6 +121,14 @@ bool GetMMXAvailable()
         if (cpuInfo[3] & CPU_MMX)
             bMMX = true;
     }
+#elif (defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))
+    unsigned int eax, ebx, ecx, edx;
+
+    if (__get_cpuid (1, &eax, &ebx, &ecx, &edx))
+    {
+        if (edx & bit_MMX)
+            bMMX = true;
+    }
 #endif
     return bMMX;
 #endif
@@ -153,6 +164,22 @@ bool GetSSEAvailable(bool bTestForSSE41)
                 bSSE = true;
         }
     }
+#elif (defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))
+    unsigned int eax, ebx, ecx, edx;
+
+    if (__get_cpuid (1, &eax, &ebx, &ecx, &edx))
+    {
+        if (bTestForSSE41)
+        {
+            if (edx & bit_SSE41)
+                bSSE = true;
+        }
+        else
+        {
+            if (edx & bit_SSE2)
+                bSSE = true;
+        }
+    }
 #endif
     return bSSE;
 #endif
@@ -166,7 +193,6 @@ bool GetAVX2Available()
     bool bAVX = false;
 #if defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
     #define CPU_AVX2 (1 << 5)
-
     int cpuInfo[4] = { 0 };
     __cpuid(cpuInfo, 0);
 
@@ -177,6 +203,14 @@ bool GetAVX2Available()
         if (cpuInfo[1] & CPU_AVX2)
             bAVX = true;
     }
+#elif (defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__))
+    unsigned int eax, ebx, ecx, edx;
+
+    if (__get_cpuid (7, &eax, &ebx, &ecx, &edx))
+    {
+        if (ebx & bit_AVX2)
+            bAVX = true;
+    }
 #endif
     return bAVX;
 #endif