diff --git a/Makefile b/Makefile
index 97c9461..cbc7c4e 100644
--- Makefile
+++ Makefile
@@ -25,10 +25,10 @@ SIMDOBJ := jpegqs_base.o jpegqs_sse2.o jpegqs_avx2.o jpegqs_avx512.o
 else ifeq ($(SIMD),none)
 SIMDFLG := -DNO_SIMD
 else ifeq ($(SIMD),native)
-ifneq (,$(filter arm% aarch64,$(ARCH)))
-SIMDFLG := -mcpu=native
+ifneq (,$(filter arm% aarch64 ppc% Power\ Macintosh,$(ARCH)))
+SIMDFLG := -mcpu=native -mtune=native
 else
-SIMDFLG := -march=native
+SIMDFLG := -march=native -mtune=native
 endif
 else ifeq ($(SIMD),avx512)
 SIMDFLG := $(SIMD_AVX512)
@@ -49,14 +49,20 @@ CFLAGS := -Wall -O2
 ifneq (,$(filter e2k,$(ARCH)))
 CFLAGS := $(filter-out -O2,$(CFLAGS)) -O3
 endif
+OMPLINK :=
 ifeq ($(OS),Darwin)
 LDFLAGS := -Wl,-dead_strip
 ifeq ($(LIBMINIOMP),)
-LDFLAGS += -lomp
+ifneq (,$(filter gcc%,$(notdir $(CC))))
+OMPLINK := -lgomp
+else
+OMPLINK := -lomp
+endif
 endif
 else
 LDFLAGS := -Wl,--gc-sections -s
 endif
+LDFLAGS += $(OMPLINK)
 
 CFLAGS_LIB := $(CFLAGS) $(MFLAGS) $(SIMDFLG)
 CFLAGS_APP := $(CFLAGS_LIB) -Wextra -pedantic $(MTOPTS)