diff --git a/Brewfile b/Brewfile
index cb16d9ba..0ac547bb 100644
--- a/Brewfile
+++ b/Brewfile
@@ -1,5 +1,6 @@
 brew "libsodium"
 brew "json-c"
 
+brew "libtool"
 brew "automake"
 brew "autoconf"
diff --git a/lib/bin/build_lib b/lib/bin/build_lib
index ad77139d..e9c4027c 100755
--- a/lib/bin/build_lib
+++ b/lib/bin/build_lib
@@ -50,7 +50,7 @@ _initialize() {
 #
 # Check if all tools needed for the default implementations are available.
 #
-# By default, this will check for `automake` (for aclocal) and `autoconf` (for autoreconf).
+# By default, this will check for `libtool` (for libtoolize), `automake` (for aclocal) and `autoconf` (for autoreconf).
 initialize_needs() { _initialize_needs "$@"; }
 _initialize_needs() {
     if [[ $platform = windows ]]; then
@@ -58,7 +58,7 @@ _initialize_needs() {
         export VSINSTALLDIR="${VSINSTALLDIR:-$(cd "$(cygpath -F 0x002a)/Microsoft Visual Studio"/*/*/Common7/.. && pwd)}"
         [[ -e "$VSINSTALLDIR/Common7/Tools/VsMSBuildCmd.bat" ]] || { echo >&2 "Missing: msbuild.  Please install 'Build Tools for Visual Studio'."; return 1; }
     else
-        needs automake autoconf
+        needs libtool automake autoconf
     fi
 }
 
diff --git a/public/site b/public/site
index 979398a3..7421e1b0 160000
--- a/public/site
+++ b/public/site
@@ -1 +1 @@
-Subproject commit 979398a3259773344412d5d3cf8ef56afc0023ef
+Subproject commit 7421e1b0a5c711e2e9ff827c21f8839e92b05e5a