diff --git a/src/parser/Makefile b/src/parser/Makefile
index bfa0516..af0baed 100644
--- a/src/parser/Makefile
+++ b/src/parser/Makefile
@@ -3,13 +3,13 @@ BISON?=bison
 FLEX?=flex
 
 BISON_VERSION=$(shell $(BISON) --version | head -n 1 | grep -o '[0-9]\.[0-9]\+')
-BISON_VERSION_SUPPORTED=$(shell echo $(BISON_VERSION) \>= 3.0 | bc)
+BISON_VERSION_SUPPORTED=$(shell awk -v a=$(BISON_VERSION) -v b="3.0" 'BEGIN { print (a >= b) ? 1 : 0 }')
 ifneq ($(BISON_VERSION_SUPPORTED), 1)
 $(error Bison version $(BISON_VERSION) not supported. If you are using OS X, `bison` uses the system default instead of the brew version. Run BISON=/usr/local/opt/bison/bin/bison make)
 endif
 
 FLEX_VERSION=$(shell $(FLEX) --version | head -n 1 | grep -o '[0-9]\.[0-9]\+')
-FLEX_VERSION_SUPPORTED=$(shell echo $(FLEX_VERSION) \>= 2.6 | bc)
+FLEX_VERSION_SUPPORTED=$(shell awk -v a=$(FLEX_VERSION) -v b="2.6" 'BEGIN { print (a >= b) ? 1 : 0 }')
 ifneq ($(FLEX_VERSION_SUPPORTED), 1)
 $(error Flex version $(FLEX_VERSION) not supported. If you are using OS X, `flex` uses the system default instead of the brew version. Run FLEX=/usr/local/opt/flex/bin/flex make)
 endif