diff --git a/.gitignore b/.gitignore
index 7678057..aef982f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,7 @@ doc/qpdf-manual.pdf
 doc/qpdf.1
 doc/zlib-flate.1
 examples/build/
+external-libs
 libqpdf.pc
 libqpdf/build/
 libqpdf/qpdf/qpdf-config.h