diff --git a/.bin/port-shlib-compare b/.bin/port-shlib-compare
new file mode 100755
index 0000000..eb535c6
--- /dev/null
+++ b/.bin/port-shlib-compare
@@ -0,0 +1,9 @@
+#!/bin/sh -xe
+
+f1=$(basename "$1").txt
+f2=$(basename "$2").txt
+
+nm -g "$1" | cut -c10- | grep -e^T > "/tmp/$f1"
+nm -g "$2" | cut -c10- | grep -e^T > "/tmp/$f2"
+
+vimdiff "/tmp/$f1" "/tmp/$f2"
diff --git a/.vimrc b/.vimrc
index 098d12e..79ca541 100644
--- a/.vimrc
+++ b/.vimrc
@@ -59,10 +59,10 @@ hi LineNr ctermfg=15
 hi EndOfBuffer ctermfg=15
 hi SpecialKey ctermfg=238
 
-hi DiffAdd    ctermbg=22   ctermfg=NONE cterm=NONE
-hi DiffDelete ctermbg=234  ctermfg=NONE cterm=NONE
-hi DiffChange ctermbg=234  ctermfg=NONE cterm=NONE
-hi DiffText   ctermbg=NONE ctermfg=NONE cterm=NONE
+"hi DiffAdd    ctermbg=22   ctermfg=NONE cterm=NONE
+"hi DiffDelete ctermbg=234  ctermfg=NONE cterm=NONE
+"hi DiffChange ctermbg=234  ctermfg=NONE cterm=NONE
+"hi DiffText   ctermbg=NONE ctermfg=NONE cterm=NONE
 
 hi VertSplit  ctermbg=NONE ctermfg=246 cterm=NONE
 hi FoldColumn ctermbg=NONE ctermfg=251 cterm=NONE