diff --git a/Local.mak.in b/Local.mak.in
index 24c058c1..1e4166b9 100644
--- a/Local.mak.in
+++ b/Local.mak.in
@@ -9,6 +9,7 @@ export HOST=@HOST@
 CPPFLAGS+=-Wall -Wextra -DXCA_PREFIX=\"${xca_prefix}\" -DETC=\"@sysconfdir@\" -DDOCDIR=\"@docdir@\"
 CFLAGS+=-O2 -ggdb -std=c++11 @CXXFLAGS@
 LIBS=@LIBS@
+EXTRA_VERSION=@EXTRA_VERSION@
 
 MOC=@QT_MOC@
 UIC=@QT_UIC@
diff --git a/OpenSSL.version b/OpenSSL.version
index 7b0e5723..4668eba7 100644
--- a/OpenSSL.version
+++ b/OpenSSL.version
@@ -1 +1 @@
-openssl-1.1.1g
+openssl-1.1.1k
diff --git a/configure.ac b/configure.ac
index 4ffa49e6..d84b9085 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,6 +19,26 @@ AC_CHECK_TOOL(WINDRES, [windres], [:])
 VERSIONHASH="$(echo "${PACKAGE_VERSION}" | shasum | cut -b -12)"
 AC_SUBST([VERSIONHASH])
 
+AC_ARG_WITH([macos-version],
+  AS_HELP_STRING([--with-macos-version], [Select macOS minimum SDK version]),
+  [ MACOS_VERSION="$withval"
+    CXXFLAGS="${CXXFLAGS} -mmacosx-version-min=$MACOS_VERSION"
+    case "$withval" in
+	10.10) EXTRA_VERSION=-Yosemite ;;
+	10.11) EXTRA_VERSION=-El-Capitan ;;
+	10.12) EXTRA_VERSION=-Sierra ;;
+	10.13) EXTRA_VERSION=-High-Sierra ;;
+	10.14) EXTRA_VERSION=-Mojave ;;
+	10.15) EXTRA_VERSION=-Catalina ;;
+	11.00) EXTRA_VERSION=-Big-Sur ;;
+	*) echo "Unknown macOS Version $withval"
+	   exit 1 ;;
+    esac
+  ]
+)
+AC_SUBST([EXTRA_VERSION])
+AC_SUBST([MACOS_VERSION])
+
 if test -d "$INSTALL_DIR"; then
   AC_MSG_NOTICE([Using INSTALL_DIR $INSTALL_DIR])
   test -d "${INSTALL_DIR}/include" && CXXFLAGS="${CXXFLAGS} -I${INSTALL_DIR}/include"
diff --git a/misc/Info.plist.in b/misc/Info.plist.in
index ac61ab6c..8ee2c44b 100644
--- a/misc/Info.plist.in
+++ b/misc/Info.plist.in
@@ -28,6 +28,8 @@
 	</array>
 	<key>LSApplicationCategoryType</key>
 	<string>public.app-category.utilities</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>@MACOS_VERSION@.0</string>
 	<key>CFBundleDocumentTypes</key>
 	<array>
 		<dict>
diff --git a/misc/build-mac.sh b/misc/build-mac.sh
index d59d0126..15ee210f 100755
--- a/misc/build-mac.sh
+++ b/misc/build-mac.sh
@@ -1,10 +1,51 @@
 #!/bin/sh -e
 
+do_openssl()
+{
+set -x
+read openssl < "`dirname $0`/../OpenSSL.version"
+test -f "$openssl".tar.gz || curl https://www.openssl.org/source/"$openssl".tar.gz > "$openssl".tar.gz
+tar zxf "$openssl".tar.gz
+(cd $openssl
+ ./Configure darwin64-x86_64-cc shared --prefix=$INSTALL_DIR $CFLAGS
+ #./config shared --prefix=$INSTALL_DIR
+ make && make install_sw
+)
+chmod 755 $INSTALL_DIR/lib/*.dylib
+}
+
+do_libtool()
+{(
+read libtool < "`dirname $0`/../Libtool.version"
+test -f "$libtool".tar.gz || curl http://ftp.gnu.org/gnu/libtool/"$libtool".tar.gz > "$libtool".tar.gz
+tar zxf "$libtool".tar.gz
+cd "$libtool"
+#export CFLAGS="-arch i386"
+./configure --prefix ${INSTALL_DIR}
+make && make install
+)}
+
 XCA_DIR="`dirname $0`"
 XCA_DIR="`cd $XCA_DIR/.. && pwd`"
 
+# define the installation dir and the path to the new library
+# it will be installed locally in the home directory
+export INSTALL_DIR="`pwd`"/install
+export DYLD_LIBRARY_PATH=$INSTALL_DIR/lib
+export CPPFLAGS="$CPPFLAGS -I${INSTALL_DIR}/include"
+export LDFLAGS="-L${INSTALL_DIR}/lib"
+
 export CFLAGS="-mmacosx-version-min=10.13"
-export EXTRA_VERSION="-High-Sierra"
+
+if test -f build-libs; then
+  mkdir -p "$INSTALL_DIR"
+  do_libtool
+  do_openssl
+fi
+unset CFLAGS
+
+XCA_DIR="`dirname $0`"
+XCA_DIR="`cd $XCA_DIR/.. && pwd`"
 
 XCA_BUILD="xca-macbuild"
 #rm -rf "$XCA_BUILD"
@@ -12,7 +53,7 @@ mkdir -p "$XCA_BUILD"
 cd "$XCA_BUILD"
 
 (cd $XCA_DIR && ./bootstrap)
-$XCA_DIR/configure
+$XCA_DIR/configure --with-macos-version=10.13 --with-openssl="$INSTALL_DIR"
 make -j5
 cp *.dmg ..