build: Change shell parameters to makefile macros.

1 files changed, 6 insertions, 6 deletions

diff --git a/build b/build
index 2a8b3bb..aa7adcb 100755
--- a/build
+++ b/build
@@ -34,13 +34,13 @@ configure-libc:
 	printf '%s\n' \
 		'libc_cv_slibdir=/lib/$(OPK_HOST_ARCH)' \
 		>>libcbuild/config.cache; \
-	if [ -n "$${TOOLS_PREFIX}" ]; then \
-		BINUTILS="--with-binutils=$${TOOLS_PREFIX}/bin"; \
+	if [ 'x$(TOOLS_PREFIX)' != 'x' ]; then \
+		BINUTILS="--with-binutils=$(TOOLS_PREFIX)/bin"; \
 	else \
 		BINUTILS=; \
 	fi && \
-	if [ -n "$${HEADERS_PREFIX}" ]; then \
-		HEADERS="--with-headers=$${HEADERS_PREFIX}/usr/include"; \
+	if [ 'x$(HEADERS_PREFIX)' != 'x' ]; then \
+		HEADERS="--with-headers=$(HEADERS_PREFIX)/usr/include"; \
 	else \
 		HEADERS=; \
 	fi && \
@@ -53,8 +53,8 @@ configure-libc:
 		--enable-kernel=3.2.0 \
 		--with-tls --with-__thread --without-cvs \
 		--without-selinux --without-gd \
-		$${BINUTILS} \
-		$${HEADERS} \
+		$(BINUTILS) \
+		$(HEADERS) \
 		--cache-file=config.cache
 	touch $@