diff --git a/Makefile b/Makefile
index 200f6d0..47b56c1 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ test: main.c twobit.c twobit.h
 	gcc -o test -Wall -g main.c twobit.c
 
 twobit.so: twobit.c
-	gcc -o twobit.so -shared twobit.c
+	gcc -o twobit.so -shared twobit.c -fPIC
 
 twoBit.pkg:
 	rm -Rf pkg.roxygen
diff --git a/Roxygen b/Roxygen
index 6c953f7..e517398 100755
--- a/Roxygen
+++ b/Roxygen
@@ -1,4 +1,4 @@
-#!/usr/bin/Rscript
+#!/usr/bin/env Rscript
 library(methods)
 library(utils)
 library(roxygen2)