configure

#!/bin/sh

echo "Checking for Bison 3.x ..."

# Find bison in PATH
BISON=$(command -v bison)

if [ -z "$BISON" ]; then
    echo "Bison not found."
    BISON_OK=#
else
    # Get the version number
    BISON_VERSION=$($BISON --version | head -n 1 | awk '{print $4}')
    MAJOR_VERSION=$(echo "$BISON_VERSION" | cut -d. -f1)

    # Ensure major version is 3 or greater
    if [ "$MAJOR_VERSION" -ge 3 ]; then
        echo "Bison version $BISON_VERSION found."
        BISON_OK=
    else
        echo "Bison version $BISON_VERSION found, but 3.x or higher is needed"
        echo "to process changes to src/parser/gramLatex.y."
        echo "Will use existing src/gramLatex.tab.c."
        BISON_OK=#
    fi
fi

sed "s/@BISON_OK@/$BISON_OK/g" src/Makevars.in >src/Makevars