diff --git a/packages/libgdiplus.rb b/packages/libgdiplus.rb
index 4a8e2dcbb0..91fefdc4a3 100644
--- a/packages/libgdiplus.rb
+++ b/packages/libgdiplus.rb
@@ -20,12 +20,14 @@ class Libgdiplus < Package
   depends_on 'imake' => :build
 
   def self.build
-    system "./configure #{CREW_OPTIONS} \
-            --with-libexif \
-            --with-libtiff \
-            --with-jpeg \
-            --with-libgif \
-            --with-x11"
+    system  "CFLAGS='-flto=auto' CXXFLAGS='-flto=auto'
+      LDFLAGS='-flto=auto' \
+      ./configure #{CREW_OPTIONS} \
+      --with-libexif \
+      --with-libtiff \
+      --with-jpeg \
+      --with-libgif \
+      --with-x11"
     system "make"
   end
 
diff --git a/packages/libwebp.rb b/packages/libwebp.rb
index d374bb2b13..935e4f0a63 100644
--- a/packages/libwebp.rb
+++ b/packages/libwebp.rb
@@ -17,16 +17,18 @@ class Libwebp < Package
 
   def self.build
     system "env NOCONFIGURE=1 ./autogen.sh"
-    system "./configure #{CREW_OPTIONS} \
-           --enable-libwebpmux \
-           --enable-libwebpdemux \
-           --enable-libwebpdecoder \
-           --enable-libwebpextras \
-           --enable-sdl \
-           --enable-tiff \
-           --enable-jpeg \
-           --enable-png \
-           --enable-gif"
+    system  "CFLAGS='-flto=auto' CXXFLAGS='-flto=auto'
+      LDFLAGS='-flto=auto' \
+      ./configure #{CREW_OPTIONS} \
+      --enable-libwebpmux \
+      --enable-libwebpdemux \
+      --enable-libwebpdecoder \
+      --enable-libwebpextras \
+      --enable-sdl \
+      --enable-tiff \
+      --enable-jpeg \
+      --enable-png \
+      --enable-gif"
     system 'make'
   end