1 files changed, 1 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 5d7f8f4..d9a887a 100644
--- a/Makefile
+++ b/Makefile
@@ -10,6 +10,7 @@ CALCULER_VERSION      := 1.0
 __CFLAGS   := -std=c99 \
 	      -Wall \
 	      -DCALCULER_VERSION=\"$(CALCULER_VERSION)\" \
+	      -DCALCULER_PREFIX=\"$(PREFIX)\" \
 	      $(shell pkg-config --cflags readline)
 __LDFLAGS  :=
 __LIBS     := $(shell pkg-config --libs readline)