update mac ci for modern brew

.github/workflows/mac-ci.yml

@@ -16,18 +16,14 @@ jobs:
     - name: Install dependencies
       run: |
         brew update
-        brew install tcl-tk || true
-        sudo mkdir -p /usr/local
-        sudo ln -sf /usr/local/opt/tcl-tk/include /usr/local/include/tcl8.6
-        sudo rm -f /usr/local/lib/libtcl* || true
-        sudo cp /usr/local/opt/tcl-tk/lib/libtcl* /usr/local/lib
-        sudo ln -sf /usr/local/opt/tcl-tk/bin/tclsh8.6 /usr/local/bin/tclsh
-        sudo ln -sf /usr/local/opt/tcl-tk/bin/tclsh8.6 /usr/local/bin/tclsh8.6
+        brew install tcl-tk autoconf libpq
     - name: configure
       run: |       
         autoreconf -vi
-        ./configure --with-tcl=/usr/local/opt/tcl-tk/lib --prefix=/usr/local        
+        export PG_CONFIG=/opt/homebrew/opt/libpq/bin/pg_config
+        ./configure --with-tcl=/opt/homebrew/opt/tcl-tk/lib/ --prefix=/usr/local        
     - name: make
       run: make
     - name: install
       run: sudo make install
+