The root cause of this issue is shown as below:
[pdfium.git] / build /
drwxr-xr-x   ..
-rw-r--r-- 310 all.gyp
-rwxr-xr-x 1153 gyp_pdfium
-rw-r--r-- 262 gyp_pdfium.py
-rw-r--r-- 7621 standalone.gypi