From: Teemu Ikonen <tpikonen@gmail.com>
Date: Sat, 13 Oct 2018 21:24:58 +0300
Subject: makefile-fix: Prepend CPPFLAGS value to CFLAGS.

---
 Makefile | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index cc65588..0213090 100644
--- a/Makefile
+++ b/Makefile
@@ -667,10 +667,11 @@ endif
 #########################################################
 CC	= gcc
 C++	= g++
+CPPFLAGS ?=
 ifneq ($(CBFDEBUG),)
-CFLAGS  += -g -O0 -Wall -D_USE_XOPEN_EXTENDED -fno-strict-aliasing -DCBFDEBUG=1  $(HDF5CFLAGS)
+CFLAGS  += $(CPPFLAGS) -g -O0 -Wall -D_USE_XOPEN_EXTENDED -fno-strict-aliasing -DCBFDEBUG=1  $(HDF5CFLAGS)
 else
-CFLAGS  += -g -O3 -Wall -D_USE_XOPEN_EXTENDED -fno-strict-aliasing  $(HDF5CFLAGS)
+CFLAGS  += $(CPPFLAGS) -g -O3 -Wall -D_USE_XOPEN_EXTENDED -fno-strict-aliasing  $(HDF5CFLAGS)
 endif
 LDFLAGS +=
 F90C = gfortran