build: better binary finding

config.mk

 # Project
 MAJOR := 15
 MINOR := 04
+PATCH := 0
 
 # Paths
 PREFIX := /usr/local
@@ -18,4 +19,4 @@ CFLAGS  += -DPACKAGE_VERSION="\"$(MAJOR).$(MINOR)\"" -DPREFIX="\"$(PREFIX)\"" -D
 RM	:= rm -f
 LN  := ln -s
 INSTALL := install
-PYTHON := python
\ No newline at end of file
+PYTHON := python

platform.mk

@@ -90,7 +90,10 @@ endef
 # Find binary
 define find_bin
 	ifeq ($$(strip $$($(1)_BIN)),)
-		HAS_$(1) := $(shell $(1) --version > /dev/null 2>&1 && echo yes || echo no)
+		$(1)_BIN := $(shell which $(1))
+	endif
+	ifeq ($$(strip $$($(1)_BIN)),)
+		HAS_$(1) := no
 	else
 		HAS_$(1) := yes
 		$(1) := $$($(1)_BIN)
@@ -102,4 +105,4 @@ define find_python
 	python_CFLAGS := $(shell $(PYTHON) -c "from distutils import sysconfig as c;print('-I%s' % c.get_python_inc())")
 	python_LIBS := $(shell $(PYTHON) -c "from distutils import sysconfig as c;print('-L%s -lpython%s' % (c.get_config_var('LIBDIR'), c.get_config_var('VERSION')))")
 	$(call have_lib,python)
-endef
\ No newline at end of file
+endef