liburing: improve 'make install'

'make install' did not install all the headers necessary to use the
library; fix.

Additionally allow specifying the install prefix, which was previously
hardcoded to /usr.

Signed-off-by: Kevin Vigor <kvigor@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Makefile

@@ -5,7 +5,7 @@ TAG = $(NAME)-$(VERSION)
 RPMBUILD=$(shell `which rpmbuild >&/dev/null` && echo "rpmbuild" || echo "rpm")
 
 INSTALL=install
-prefix=/usr
+prefix ?= /usr
 includedir=$(prefix)/include
 libdir=$(prefix)/lib
 mandir=$(prefix)/man

src/Makefile

@@ -1,4 +1,4 @@
-prefix=/usr
+prefix ?= /usr
 includedir=$(prefix)/include
 libdir=$(prefix)/lib
 
@@ -47,6 +47,9 @@ $(libname): $(liburing_sobjs) liburing.map
 
 install: $(all_targets)
 	install -D -m 644 io_uring.h $(includedir)/io_uring.h
+	install -D -m 644 liburing.h $(includedir)/liburing.h
+	install -D -m 644 compat.h $(includedir)/compat.h
+	install -D -m 644 barrier.h $(includedir)/barrier.h
 	install -D -m 644 liburing.a $(libdir)/liburing.a
 ifeq ($(ENABLE_SHARED),1)
 	install -D -m 755 $(libname) $(libdir)/$(libname)