CHIA-2091 Use boost v1.85 when compiling chiavdf from source on macos…

…-intel (#19065)

install-timelord.sh

@@ -131,7 +131,12 @@ else
     symlink_vdf_bench "$PYTHON_VERSION"
   elif [ -e venv/bin/python ] && test "$MACOS"; then
     echo "Installing chiavdf dependencies for MacOS."
-    brew install --formula --quiet boost cmake gmp
+    # The most recent boost version causes compile errors.
+    brew install --formula --quiet [email protected] cmake gmp
+    # [email protected] is keg-only, which means it was not symlinked into /usr/local,
+    # because this is an alternate version of another formula.
+    export LDFLAGS="-L/usr/local/opt/[email protected]/lib"
+    export CPPFLAGS="-I/usr/local/opt/[email protected]/include"
     echo "Installing chiavdf from source."
     # User needs to provide required packages
     echo venv/bin/python -m pip install --force --no-binary chiavdf "$CHIAVDF_VERSION"