diff --git a/install-all.sh b/install-all.sh
index f41eee99..2653d24c 100755
--- a/install-all.sh
+++ b/install-all.sh
@@ -59,9 +59,9 @@ cygwin_prepare()
     mv apt-cyg /usr/local/bin/
 
     if [ -n "$CYG_MIRROR" ]; then
-        apt-cyg -m $CYG_MIRROR install git make gcc-core m4 automake autoconf pkg-config openssl-devel libexpat-devel zlib-devel libncursesw-devel libglib2.0-devel libcurl-devel libidn-devel libssh2-devel libkrb5-devel openldap-devel libgcrypt-devel
+        apt-cyg -m $CYG_MIRROR install git make gcc-core m4 automake autoconf pkg-config openssl-devel libexpat-devel zlib-devel libncursesw-devel libglib2.0-devel libcurl-devel libidn-devel libssh2-devel libkrb5-devel openldap-devel libgcrypt-devel gnutls-devel
     else
-        apt-cyg install git make gcc-core m4 automake autoconf pkg-config openssl-devel libexpat-devel zlib-devel libncursesw-devel libglib2.0-devel libcurl-devel libidn-devel libssh2-devel libkrb5-devel openldap-devel libgcrypt-devel
+        apt-cyg install git make gcc-core m4 automake autoconf pkg-config openssl-devel libexpat-devel zlib-devel libncursesw-devel libglib2.0-devel libcurl-devel libidn-devel libssh2-devel libkrb5-devel openldap-devel libgcrypt-devel gnutls-devel
 
     fi