Index: libraries/source/fcollada/build.sh
--- libraries/source/fcollada/build.sh.orig
+++ libraries/source/fcollada/build.sh
@@ -5,6 +5,7 @@ cd "$(dirname "$0")"
 
 PV=28209
 LIB_VERSION=${PV}
+TAR=${TAR:-tar}
 
 fetch()
 {
@@ -42,7 +43,7 @@ fi
 
 # unpack
 rm -Rf fcollada-${PV}
-tar xf fcollada-${PV}.tar.xz
+$TAR xf fcollada-${PV}.tar.xz
 
 # build
 (
