diff --git a/Makefile.in b/Makefile.in
index 26a77b2..e6bf6e7 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,11 +1,5 @@
 VPATH=%VPATH%
 
-CC ?= gcc
-CXX ?= g++
-CXXFLAGS ?=
-AR ?= ar
-RUSTC ?= rustc
-RUSTFLAGS ?=
 CFLAGS += -fPIC
 
 RUST_SRC=$(shell find $(VPATH)/. -type f -name '*.rs')
diff --git a/configure b/configure
index ed6c06e..0183abc 100644
--- a/configure
+++ b/configure
@@ -1,5 +1,4 @@
 #!/bin/bash
 
 SRCDIR="$(cd $(dirname $0) && pwd)"
-sed "s#%VPATH%#${SRCDIR}#" ${SRCDIR}/Makefile.in > Makefile
-
+sed -e "s#%VPATH%#${SRCDIR}#" ${SRCDIR}/Makefile.in > Makefile