Documentation fixes in build.sh script/usage file

Author: rouson

prerequisites/build.sh

@@ -34,8 +34,8 @@
 export OPENCOARRAYS_SRC_DIR="${OPENCOARRAYS_SRC_DIR:-${PWD}/..}"
 export __usage=${OPENCOARRAYS_SRC_DIR}/prerequisites/build.sh-usage
 if [[ ! -f "${OPENCOARRAYS_SRC_DIR}/src/libcaf.h" ]]; then
-  echo "Please run this script inside the top-level OpenCoarrays source directory "
-  echo "or set OPENCOARRAYS_SRC_DIR to the OpenCoarrays source directory path."
+  echo "Please run this script inside the OpenCoarrays source \"prerequisites\" subdirectory"
+  echo "or set OPENCOARRAYS_SRC_DIR to the top-level OpenCoarrays source directory path."
   exit 1
 fi
 export B3B_USE_CASE="${B3B_USE_CASE:-${OPENCOARRAYS_SRC_DIR}/prerequisites/use-case}"

prerequisites/build.sh-usage

@@ -6,7 +6,7 @@
   -e --verbose                Enable verbose mode, print script as it is executed.
   -f --with-fortran [arg]     Specify Fortran compiler location. Default="gfortran"
   -h --help                   This page.
-  -i --install-dir [arg]      Install package in specified path. Default="${OPENCOARRAYS_SRC_DIR}/prerequisites/installations/${package_name:-}/${version_to_build:-}/"
+  -i --install-dir [arg]      Install package in specified path. Default="${OPENCOARRAYS_SRC_DIR}/prerequisites/installations/${package_name:-}/"
   -j --num-threads [arg]      Number of threads to use when invoking make. Default="1"
   -I --install-version [arg]  Package version to install. (To see default, use -V or --print-version)
   -l --list-packages          List the packages this script can install.