From 7aec563b868e0ec03385ee68ea67101b47d568ce Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Tue, 18 Jul 2023 17:02:48 -0400
Subject: [PATCH] building lammps-shell requires pkg-config

---
 cmake/Modules/Tools.cmake | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmake/Modules/Tools.cmake b/cmake/Modules/Tools.cmake
index 285c5f2405..148fb6440e 100644
--- a/cmake/Modules/Tools.cmake
+++ b/cmake/Modules/Tools.cmake
@@ -37,7 +37,11 @@ if(BUILD_TOOLS)
   add_subdirectory(${LAMMPS_TOOLS_DIR}/phonon ${CMAKE_BINARY_DIR}/phana_build)
 endif()
 
+find_package(PkgConfig QUIET)
 if(BUILD_LAMMPS_SHELL)
+  if(NOT PkgConfig_FOUND)
+    message(FATAL_ERROR "Must have pkg-config installed for building LAMMPS shell")
+  endif()
   find_package(PkgConfig REQUIRED)
   pkg_check_modules(READLINE IMPORTED_TARGET REQUIRED readline)
   if(NOT LAMMPS_EXCEPTIONS)