Index: src/OFSystemInfo.m
==================================================================
--- src/OFSystemInfo.m
+++ src/OFSystemInfo.m
@@ -30,11 +30,17 @@
 #endif
 #ifdef OF_MACOS
 # include <sys/sysctl.h>
 #endif
 
-#ifdef OF_MORPHOS
+#if defined(OF_AMIGAOS4)
+# define __USE_INLINE__
+# define __NOLIBBASE__
+# define __NOGLOBALIFACE__
+# include <exec/exectags.h>
+# include <proto/exec.h>
+#elif defined(OF_MORPHOS)
 # include <exec/system.h>
 # include <proto/exec.h>
 #endif
 
 #import "OFSystemInfo.h"
@@ -94,10 +100,14 @@
 #if defined(OF_X86_64) || defined(OF_X86)
 struct x86_regs {
 	uint32_t eax, ebx, ecx, edx;
 };
 #endif
+
+#ifdef OF_AMIGAOS4
+extern struct ExecIFace *IExec;
+#endif
 
 static size_t pageSize = 4096;
 static size_t numberOfCPUs = 1;
 static OFString *operatingSystemName = nil;
 static OFString *operatingSystemVersion = nil;
@@ -618,10 +628,16 @@
 	int name[2] = { CTL_HW, HW_VECTORUNIT }, value = 0;
 	size_t length = sizeof(value);
 
 	if (sysctl(name, 2, &value, &length, NULL, 0) == 0)
 		return value;
+# elif defined(OF_AMIGAOS4)
+	uint32_t vectorUnit;
+
+	GetCPUInfoTags(GCIT_VectorUnit, &vectorUnit, TAG_END);
+
+	return (vectorUnit == VECTORTYPE_ALTIVEC);
 # elif defined(OF_MORPHOS)
 	uint32_t supportsAltiVec;
 
 	if (NewGetSystemAttrs(&supportsAltiVec, sizeof(supportsAltiVec),
 	    SYSTEMINFOTYPE_PPC_ALTIVEC, TAG_DONE) > 0)