5 files changed, 25 insertions, 10 deletions
diff --git a/Makefile b/Makefile
index da70bbc..95f6335 100644
--- a/Makefile
+++ b/Makefile
@@ -1,16 +1,19 @@
-.NONPOSIX:
+.POSIX:
 
 CONFIGFILE = config.mk
+include $(CONFIGFILE)
+
+OS = linux
+# Linux:   linux
+# Mac OS:  macos
+# Windows: windows
+include mk/$(OS).mk
 
-OSCONFIGFILE = linux.mk
-# Change to macos.mk for Mac OS
 
 LIB_MAJOR = 1
 LIB_MINOR = 0
 LIB_VERSION = $(LIB_MAJOR).$(LIB_MINOR)
 
-include $(CONFIGFILE)
-include $(OSCONFIGFILE)
 
 HDR =\
 	libsha2.h\
@@ -34,7 +37,7 @@ OBJ =\
 	sum_fd.o\
 	unhex.o\
 	unmarshal.o\
-	update.o\
+	update.o
 
 MAN0 =\
 	libsha2.h.0
@@ -92,6 +95,7 @@ install:
 	mkdir -p -- "$(DESTDIR)$(MANPREFIX)/man3"
 	cp -- libsha2.a "$(DESTDIR)$(PREFIX)/lib"
 	cp -- libsha2.$(LIBEXT) "$(DESTDIR)$(PREFIX)/lib/libsha2.$(LIBMINOREXT)"
+	$(FIX_INSTALL_NAME) -- "$(DESTDIR)$(PREFIX)/lib/libsha2.$(LIBMINOREXT)"
 	ln -sf -- "libsha2.$(LIBMINOREXT).$(LIB_MINOR)" "$(DESTDIR)$(PREFIX)/lib/libsha2.$(LIBMAJOREXT)"
 	ln -sf -- "libsha2.$(LIBMAJOREXT)" "$(DESTDIR)$(PREFIX)/lib/libsha2.$(LIBEXT)"
 	cp -- libsha2.h "$(DESTDIR)$(PREFIX)/include"
diff --git a/config.mk b/config.mk
index a2d88f2..2062ea6 100644
--- a/config.mk
+++ b/config.mk
@@ -1,8 +1,8 @@
 PREFIX    = /usr
 MANPREFIX = $(PREFIX)/share/man
 
-CC = cc
+CC = c99
 
 CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700
-CFLAGS   = -std=c99 -Wall -O3
+CFLAGS   = -Wall -O3
 LDFLAGS  = -s
diff --git a/linux.mk b/mk/linux.mk
index 3618fcd..5604525 100644
--- a/linux.mk
+++ b/mk/linux.mk
@@ -3,3 +3,5 @@ LIBFLAGS = -shared -Wl,-soname,libsha2.$(LIBEXT).$(LIB_MAJOR)
 
 LIBMAJOREXT = $(LIBEXT).$(LIB_MAJOR)
 LIBMINOREXT = $(LIBEXT).$(LIB_MAJOR).$(LIB_MINOR)
+
+FIX_INSTALL_NAME = :
diff --git a/mk/macos.mk b/mk/macos.mk
new file mode 100644
index 0000000..89186f9
--- /dev/null
+++ b/mk/macos.mk
@@ -0,0 +1,7 @@
+LIBEXT   = dylib
+LIBFLAGS = -dynamiclib -Wl,-compatibility_version,$(LIB_MAJOR) -Wl,-current_version,$(LIB_VERSION)
+
+LIBMAJOREXT = $(LIB_MAJOR).$(LIBEXT)
+LIBMINOREXT = $(LIB_MAJOR).$(LIB_MINOR).$(LIBEXT)
+
+FIX_INSTALL_NAME = install_name_tool -id "$(PREFIX)/lib/libsha2.$(LIBMAJOREXT)"
diff --git a/macos.mk b/mk/windows.mk
index 47d4b44..304b6be 100644
--- a/macos.mk
+++ b/mk/windows.mk
@@ -1,5 +1,7 @@
-LIBEXT   = dylib
-LIBFLAGS = -dynamiclib
+LIBEXT   = dll
+LIBFLAGS = -shared
 
 LIBMAJOREXT = $(LIB_MAJOR).$(LIBEXT)
 LIBMINOREXT = $(LIB_MAJOR).$(LIB_MINOR).$(LIBEXT)
+
+FIX_INSTALL_NAME = :