diff --git a/src/SPC/builder/linux/library/libpng.php b/src/SPC/builder/linux/library/libpng.php
index 370add16..f87d2bc5 100644
--- a/src/SPC/builder/linux/library/libpng.php
+++ b/src/SPC/builder/linux/library/libpng.php
@@ -45,6 +45,7 @@ class libpng extends LinuxLibraryBase
         Patcher::patchUnixLibpng();
 
         shell()->cd($this->source_dir)
+            ->exec('chmod +x ./configure')
             ->exec(
                 "{$this->builder->configure_env} ./configure " .
                 "--host={$this->builder->gnu_arch}-unknown-linux " .
diff --git a/src/SPC/builder/macos/library/libpng.php b/src/SPC/builder/macos/library/libpng.php
index 4ffb44be..f52d7233 100644
--- a/src/SPC/builder/macos/library/libpng.php
+++ b/src/SPC/builder/macos/library/libpng.php
@@ -44,6 +44,7 @@ class libpng extends MacOSLibraryBase
         // patch configure
         Patcher::patchUnixLibpng();
         shell()->cd($this->source_dir)
+            ->exec('chmod +x ./configure')
             ->exec(
                 "{$this->builder->configure_env} ./configure " .
                 "--host={$this->builder->gnu_arch}-apple-darwin " .