diff --git a/.gitignore b/.gitignore
index b01441ce1be6..d684fcb90182 100644
--- a/.gitignore
+++ b/.gitignore
@@ -360,3 +360,6 @@ docs/mots/index.rst
 
 # Ignore generated directory with .class files for GeckoView annotation processor
 mobile/android/annotations/bin/
+
+# Ignore generated log files under media/libvpx
+media/libvpx/config/**/config.log
diff --git a/.hgignore b/.hgignore
index 9316aed506bd..e1a360b07142 100644
--- a/.hgignore
+++ b/.hgignore
@@ -352,3 +352,6 @@ tps_result\.json$
 
 # Ignore generated directory with .class files for GeckoView annotation processor
 ^mobile/android/annotations/bin/
+
+# Ignore generated log files under media/libvpx
+^media/libvpx/config/.*/config.log
diff --git a/media/libvpx/generate_sources_mozbuild.sh b/media/libvpx/generate_sources_mozbuild.sh
index 5e68d66837b0..4efcb54aa1aa 100755
--- a/media/libvpx/generate_sources_mozbuild.sh
+++ b/media/libvpx/generate_sources_mozbuild.sh
@@ -169,7 +169,8 @@ function gen_rtcd_header {
 # $1 - Header file directory.
 # $2 - Config command line.
 function gen_config_files {
-  ./configure $2 > /dev/null
+  ./configure $2 --log=$BASE_DIR/$LIBVPX_CONFIG_DIR/$1/config.log > /dev/null
+  echo "Log file: $BASE_DIR/$LIBVPX_CONFIG_DIR/$1/config.log"
 
   # Disable HAVE_UNISTD_H.
   ( echo '/HAVE_UNISTD_H'; echo 'd' ; echo 'w' ; echo 'q' ) | ed -s vpx_config.h