--- Makefile.in.orig	2020-02-14 00:23:53.478030719 -0500
+++ Makefile.in	2020-02-14 00:24:47.868286258 -0500
@@ -25,11 +25,11 @@ CFITSIO_MAJOR	= @CFITSIO_MAJOR@
 CFITSIO_MINOR	= @CFITSIO_MINOR@
 CFITSIO_SONAME	= @CFITSIO_SONAME@
 
-prefix		= @prefix@
+prefix		= ${DESTDIR}@prefix@
 exec_prefix	= @exec_prefix@
-CFITSIO_BIN	= ${DESTDIR}@bindir@
-CFITSIO_LIB	= ${DESTDIR}@libdir@
-CFITSIO_INCLUDE	= ${DESTDIR}@includedir@
+CFITSIO_BIN	= @bindir@
+CFITSIO_LIB	= @libdir@
+CFITSIO_INCLUDE	= @includedir@
 INSTALL_DIRS	= @INSTALL_ROOT@ ${CFITSIO_INCLUDE} ${CFITSIO_LIB} ${CFITSIO_LIB}/pkgconfig