File leansdr-obey-cflags.patch of Package leansdr

diff --git a/src/apps/Makefile b/src/apps/Makefile
index 0e4ff41..901b1e3 100644
--- a/src/apps/Makefile
+++ b/src/apps/Makefile
@@ -4,7 +4,7 @@ VERSION	:= leansdr-$(shell git describe)
 
 # Portable flags for development.
 
-CXXFLAGS	= -O3 -I.. -DVERSION=\"$(VERSION)\" \
+CXXFLAGS	+= -O3 -I.. -DVERSION=\"$(VERSION)\" \
 		  -Wall \
 		  -Wno-sign-compare -Wno-array-bounds -Wno-unused-variable