diff --git a/download_sources.sh b/download_sources.sh
index 5b65ea4..262a696 100755
--- a/download_sources.sh
+++ b/download_sources.sh
@@ -4,10 +4,12 @@
 # This particular script is dual-licensed between BSD 2-Clause
 # or GPL3, at your preference.
 # n() function taken from otto-pkg's posix-alt.shi lib.
-
+# realpath() function taken from Pindorama/Copacabana version
+# of this script.
 # USAGE: ./download_sources.sh sources.list sources.md5
 
 MD5CHECK=${MD5CHECK:-YES};
+SRCDIR=${SRCDIR:-src}
 
 # Workaround to the # macro in arrays
 # which doesn't work properly in bash 4.3 for some reason.
@@ -15,19 +17,30 @@ n(){
 	echo ${@} | tr " " "\n" | wc -l;
 }
 
+realpath(){
+  file_basename=`basename $1`
+  file_dirname=`dirname $1`
+	# get the absolute directory name
+	# example: ./sources.txt -> /usr/src/copacabana-repo/sources.txt
+  echo "`cd "${file_dirname}"; pwd`/${file_basename}"
+}
+
+
 main(){
-	PARENTDIR=${PWD};
-	test ! -e src && mkdir src;
-	urls=( `cat ${1} | tr "\n" " "` );
+	sources_file="`realpath ${1}`"
+	test -n "${2}" && md5sum_file="`realpath ${2}`"
+	test ! -e "${SRCDIR}" && mkdir "${SRCDIR}";
+	urls=( `cat ${sources_file} | tr "\n" " "` );
 	n_urls=`n ${urls[*]}`;
-	cd src;
+	cd "${SRCDIR}";
 	for (( i=0; i < ${n_urls}; i++ )){
-		printf '%s\n' "Downloading $(basename ${urls[${i}]})";
-		curl -L ${urls[${i}]} -O;
+		printf 'Downloading %s\n' "$(basename ${urls[${i}]})";
+		curl -L "${urls[${i}]}" -O;
 	}
-	[ ${MD5CHECK} == 'YES' ] &&
-	md5sum -c ${PARENTDIR}/${2};
-	cd ${PARENTDIR};
+	if `echo ${MD5CHECK} | grep -i '^y' &>/dev/null`; then
+	  md5sum -c "${md5sum_file}" \
+	  	&& cd "${OLDPWD}";
+	fi
 	return 0;
 }