diff --git a/Makefile b/Makefile
index 8b20476..3e1efc7 100644
--- a/Makefile
+++ b/Makefile
@@ -159,9 +159,14 @@
 $(error Invalid CONFIG value '$(CONFIG)')
 endif
 
+ifeq ($(SYSTEM),Linux)
+TMPOUT = /dev/null
+else
+TMPOUT = `mktemp /tmp/test-out-XXXXXX`
+endif
 
 # Detect if we can use C++11
-CXX11_CHECK_CMD = $(CXX) -std=c++11 -o /dev/null -c test/build/c++11.cc
+CXX11_CHECK_CMD = $(CXX) -std=c++11 -o $(TMPOUT) -c test/build/c++11.cc
 HAS_CXX11 = $(shell $(CXX11_CHECK_CMD) 2> /dev/null && echo true || echo false)
 
 # The HOST compiler settings are used to compile the protoc plugins.
@@ -194,9 +199,25 @@
 
 INCLUDES = . include $(GENDIR)
 ifeq ($(SYSTEM),Darwin)
-INCLUDES += /usr/local/ssl/include /opt/local/include
+ifneq ($(wildcard /usr/local/ssl/include),)
+INCLUDES += /usr/local/ssl/include
+endif
+ifneq ($(wildcard /opt/local/include),)
+INCLUDES += /opt/local/include
+endif
+ifneq ($(wildcard /usr/local/include),)
+INCLUDES += /usr/local/include
+endif
 LIBS = m z
-LDFLAGS += -L/usr/local/ssl/lib -L/opt/local/lib
+ifneq ($(wildcard /usr/local/ssl/lib),)
+LDFLAGS += -L/usr/local/ssl/lib
+endif
+ifneq ($(wildcard /opt/local/lib),)
+LDFLAGS += -L/opt/local/lib
+endif
+ifneq ($(wildcard /usr/local/lib),)
+LDFLAGS += -L/usr/local/lib
+endif
 else
 LIBS = rt m z pthread
 LDFLAGS += -pthread
@@ -251,10 +272,10 @@
 IS_GIT_FOLDER = true
 endif
 
-OPENSSL_ALPN_CHECK_CMD = $(CC) $(CFLAGS) $(CPPFLAGS) -o /dev/null test/build/openssl-alpn.c -lssl -lcrypto -ldl $(LDFLAGS)
-ZLIB_CHECK_CMD = $(CC) $(CFLAGS) $(CPPFLAGS) -o /dev/null test/build/zlib.c -lz $(LDFLAGS)
-PERFTOOLS_CHECK_CMD = $(CC) $(CFLAGS) $(CPPFLAGS) -o /dev/null test/build/perftools.c -lprofiler $(LDFLAGS)
-PROTOBUF_CHECK_CMD = $(CXX) $(CXXFLAGS) $(CPPFLAGS) -o /dev/null test/build/protobuf.cc -lprotobuf $(LDFLAGS)
+OPENSSL_ALPN_CHECK_CMD = $(CC) $(CFLAGS) $(CPPFLAGS) -o $(TMPOUT) test/build/openssl-alpn.c -lssl -lcrypto -ldl $(LDFLAGS)
+ZLIB_CHECK_CMD = $(CC) $(CFLAGS) $(CPPFLAGS) -o $(TMPOUT) test/build/zlib.c -lz $(LDFLAGS)
+PERFTOOLS_CHECK_CMD = $(CC) $(CFLAGS) $(CPPFLAGS) -o $(TMPOUT) test/build/perftools.c -lprofiler $(LDFLAGS)
+PROTOBUF_CHECK_CMD = $(CXX) $(CXXFLAGS) $(CPPFLAGS) -o $(TMPOUT) test/build/protobuf.cc -lprotobuf $(LDFLAGS)
 PROTOC_CMD = which protoc
 PROTOC_CHECK_CMD = protoc --version | grep -q libprotoc.3