[fix] dispatcher script on old macOS

Author: h-2

bin/lambda2.in

@@ -1,6 +1,6 @@
 #!/bin/sh
 
-CURDIR="$(readlink -f $(dirname "$0"))/"
+CURDIR="$(cd "$(dirname "$0")" && pwd -P)/"
 SYSTEM_BIN_DIR="@CMAKE_INSTALL_FULL_BINDIR@/"
 
 if [ "${CURDIR}" = "${SYSTEM_BIN_DIR}" ]; then          # we are installed