diff --git a/GNUmakefile b/GNUmakefile
index e45f7b3a..a8162f15 100755
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -29,15 +29,16 @@ IS_CYGWIN := $(shell $(CXX) -dumpmachine 2>&1 | $(EGREP) -i -c "Cygwin")
 IS_DARWIN := $(shell $(CXX) -dumpmachine 2>&1 | $(EGREP) -i -c "Darwin")
 IS_NETBSD := $(shell $(CXX) -dumpmachine 2>&1 | $(EGREP) -i -c "NetBSD")
 
-SUN_COMPILER := $(shell $(CXX) -V 2>&1 | $(EGREP) -i -c "CC: Sun")
+SUN_COMPILER := $(shell $(CXX) -V 2>&1 | $(EGREP) -i -c "CC: (Sun|Studio)")
 GCC_COMPILER := $(shell $(CXX) --version 2>&1 | $(EGREP) -i -v "clang" | $(EGREP) -i -c "(gcc|g\+\+)")
 CLANG_COMPILER := $(shell $(CXX) --version 2>&1 | $(EGREP) -i -c "clang")
 INTEL_COMPILER := $(shell $(CXX) --version 2>&1 | $(EGREP) -i -c "\(icc\)")
 MACPORTS_COMPILER := $(shell $(CXX) --version 2>&1 | $(EGREP) -i -c "macports")
 
 # Sun Studio 12.0 (0x0510) and 12.3 (0x0512)
-SUNCC_120_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: Sun .* (5\.1[0-9]|5\.[2-9]|6\.)")
-SUNCC_123_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: Sun .* (5\.1[2-9]|5\.[2-9]|6\.)")
+SUNCC_120_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: (Sun|Studio) .* (5\.1[0-9]|5\.[2-9]|6\.)")
+SUNCC_122_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: (Sun|Studio) .* (5\.1[1-9]|5\.[2-9]|6\.)")
+SUNCC_123_OR_LATER := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: (Sun|Studio) .* (5\.1[2-9]|5\.[2-9]|6\.)")
 
 HAS_SOLIB_VERSION := $(IS_LINUX)
 
@@ -265,7 +266,11 @@ ifneq ($(IS_X86),1)
 CXXFLAGS += -KPIC
 endif
 # Add to all Solaris
-CXXFLAGS += -template=no%extdef -w -erroff=wvarhidemem -erroff=voidretw
+CXXFLAGS += -template=no%extdef
+# Add to Sun Studio 12.2 and above
+ifneq ($(SUNCC_122_OR_LATER),0)
+CXXFLAGS += -w -erroff=wvarhidemem -erroff=voidretw
+endif
 SUN_CC10_BUGGY := $(shell $(CXX) -V 2>&1 | $(EGREP) -c "CC: Sun .* 5\.10 .* (2009|2010/0[1-4])")
 ifneq ($(SUN_CC10_BUGGY),0)
 # -DCRYPTOPP_INCLUDE_VECTOR_CC is needed for Sun Studio 12u1 Sun C++ 5.10 SunOS_i386 128229-02 2009/09/21 and was fixed in May 2010