do not get dependencies when folders exist

build.sh

@@ -10,26 +10,42 @@ scdir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 builddir="$scdir"/build
 fbxsdkdir="$builddir"/fbxsdk
 fbxpydir="$builddir"/fbxpy
+reqsfile="${scdir}"/reqs.txt
 [ -d "$builddir" ] || mkdir "$builddir"
 
-# Download fbxsdk and fbxsdk python bindings
-while read l; do curl -L -O $l; done < "$scdir"/reqs.txt
-ls -1 *.tar.gz|while read a;do tar -xvzf "$a" -C "$builddir";done
-rm fbx*.tar.gz
-
-# install fbxsdk
-[ -d "$fbxsdkdir" ] || (mkdir "$fbxsdkdir" && printf "yes\nn\n" |"$builddir"/fbx*fbxsdk_linux "$fbxsdkdir")
-
-# install fbxsdk python bindings
-[ -d "$fbxpydir" ] || (mkdir "$fbxpydir" && printf "yes\nn\n" |"$builddir"/fbx*fbxpythonbindings_linux "$fbxpydir")
-
-# patch sip files and library headers so that they compile with sip5
-patch -p0 < patch
-
-# patch libfbxsdk.so because it is not linked against libxml2 and libz for some reason  
-patchelf --add-needed libz.so.1 ${fbxsdkdir}/lib/gcc/x64/release/libfbxsdk.so
-patchelf --add-needed libxml2.so.2 ${fbxsdkdir}/lib/gcc/x64/release/libfbxsdk.so
+# download fbxsdk
+if [ ! -d "$fbxsdkdir" ]
+then
+  mkdir "$fbxsdkdir"
+  url=$(grep 'fbx.*fbxsdk' $reqsfile)
+  file=${url##*/}
+  tar="${fbxsdkdir}/${f}"
+  curl -L -o "$tar" $url
+  tar -xvzf "$tar" -C "$fbxsdkdir"
+  printf "yes\nn\n" |"$fbxsdkdir"/fbx*fbxsdk_linux "$fbxsdkdir"
+  # patch libfbxsdk.so because it is not linked against libxml2 and libz for some reason  
+  patchelf --add-needed libz.so.1 ${fbxsdkdir}/lib/gcc/x64/release/libfbxsdk.so
+  patchelf --add-needed libxml2.so.2 ${fbxsdkdir}/lib/gcc/x64/release/libfbxsdk.so
+else
+  echo "Skipping installation of fbxsdk because "$fbxsdkdir" exists"
+fi
+
+# download fbxsdk python bindings
+if [ ! -d "$fbxpydir" ]
+then
+  mkdir "$fbxpydir"
+  url=$(grep 'fbx.*fbxpythonbindings_linux' $reqsfile)
+  file=${url##*/}
+  tar="${fbxpydir}/${f}"
+  curl -L -o "$tar" $url
+  tar -xvzf "$tar" -C "$fbxpydir"
+  printf "yes\nn\n"|"$fbxpydir"/fbx*fbxpythonbindings_linux "$fbxpydir"
+  # patch sip files and library headers so that they compile with sip5
+  patch -N -p0 < patch
+else
+  echo "Skipping installation of fbx python bindings because "$fbxpydir" exists"
+fi
 
 sip-wheel --verbose
 
-LD_LIBRARY_PATH=$(pwd)/build/fbxsdk/lib/gcc/x64/release/:$LD_LIBRARY_PATH auditwheel -v repair $(ls -1t fbx*.whl|head -1)
+LD_LIBRARY_PATH=${fbxsdkdir}/lib/gcc/x64/release/:$LD_LIBRARY_PATH auditwheel -v repair $(ls -1t fbx*.whl|head -1)