diff --git a/cmake/Templates/HEJ-config.cc.in b/cmake/Templates/HEJ-config.cc.in
index bbb4f41..02c0f73 100644
--- a/cmake/Templates/HEJ-config.cc.in
+++ b/cmake/Templates/HEJ-config.cc.in
@@ -1,105 +1,111 @@
 /**
  *  \authors   The HEJ collaboration (see AUTHORS for details)
  *  \date      2019-2022
  *  \copyright GPLv2 or later
  */
+#include <cassert>
 #include <iostream>
 #include <cstdlib>
 #include <string>
 #include <string_view>
 
 #include "cxxopts.hpp"
 
 #include "HEJ/ConfigFlags.hh"
 
 namespace {
   constexpr std::string_view get_features() {
     std::string_view features = ""
 #ifdef HEJ_BUILD_WITH_QCDLOOP
       "QCDloop "
 #endif
 #ifdef HEJ_BUILD_WITH_HepMC2
       "HepMC2 "
 #endif
 #ifdef HEJ_BUILD_WITH_HepMC3
       "HepMC3 "
 #endif
 #ifdef HEJ_BUILD_WITH_RIVET
 #ifdef HEJ_USE_RIVET2
       "Rivet2 "
 #else
       "Rivet3 "
 #endif
 #endif
 #ifdef HEJ_BUILD_WITH_HDF5
       "HDF5 "
 #endif
       ;
     if(! features.empty()) {
       features.remove_suffix(1);
     }
     return features;
   }
 
   constexpr std::string_view FEATURES = get_features();
 }
 
 int main(int argc, char** argv) {
   cxxopts::Options options{
     argv[0],
     "Configuration of the @CMAKE_PROJECT_NAME@ installation"
   };
 
   options.add_options()
     ("h,help", "show this help message and exit")
     ("prefix", "show @CMAKE_PROJECT_NAME@ installation prefix")
     ("includedir", "show the path with the installed @CMAKE_PROJECT_NAME@ header files")
     ("bindir", "show the path with the installed @CMAKE_PROJECT_NAME@ executable")
     ("libdir", "show the path with the installed @CMAKE_PROJECT_NAME@ library file")
     ("libs", "show flags for linking the @CMAKE_PROJECT_NAME@ library")
     ("cxxflags", "show the compiler flags for the @CMAKE_PROJECT_NAME@ headers")
     ("cxx", "show the compiler used to build @CMAKE_PROJECT_NAME@")
     ("features", "show the optional features enabled when building @CMAKE_PROJECT_NAME@")
     ("version", "show the installed @CMAKE_PROJECT_NAME@ version")
     ("revision", "show the hash of the installed @CMAKE_PROJECT_NAME@ git revision")
     ;
   if(argc == 1) {
       std::cout << options.help();
       return EXIT_SUCCESS;
   }
   try {
     const auto opts = options.parse(argc, argv);
     if(opts.count("help")) {
       std::cout << options.help();
       return EXIT_SUCCESS;
     }
+    std::string output{};
     for(auto const & op: opts.arguments()){
       if(op.key()=="prefix")
-        std::cout << "@CMAKE_INSTALL_PREFIX@";
+        output += "@CMAKE_INSTALL_PREFIX@";
       else if(op.key()=="includedir")
-        std::cout << "@CMAKE_INSTALL_PREFIX@/@INSTALL_INCLUDE_DIR_BASE@";
+        output += "@CMAKE_INSTALL_PREFIX@/@INSTALL_INCLUDE_DIR_BASE@";
       else if(op.key()=="bindir")
-        std::cout << "@CMAKE_INSTALL_PREFIX@/@INSTALL_BIN_DIR@";
+        output += "@CMAKE_INSTALL_PREFIX@/@INSTALL_BIN_DIR@";
       else if(op.key()=="libdir")
-        std::cout << "@CMAKE_INSTALL_PREFIX@/@INSTALL_LIB_DIR@";
+        output += "@CMAKE_INSTALL_PREFIX@/@INSTALL_LIB_DIR@";
       else if(op.key()=="libs")
-        std::cout << "-L@CMAKE_INSTALL_PREFIX@/@INSTALL_LIB_DIR@ -lHEJ";
+        output += "-L@CMAKE_INSTALL_PREFIX@/@INSTALL_LIB_DIR@ -lHEJ";
       else if(op.key()=="cxxflags")
-        std::cout << "-I@CMAKE_INSTALL_PREFIX@/@INSTALL_INCLUDE_DIR_BASE@";
+        output += "-I@CMAKE_INSTALL_PREFIX@/@INSTALL_INCLUDE_DIR_BASE@";
       else if(op.key()=="cxx")
-        std::cout << "@CMAKE_CXX_COMPILER@";
+        output += "@CMAKE_CXX_COMPILER@";
       else if(op.key()=="features")
-        std::cout << FEATURES;
+        output += FEATURES;
       else if(op.key()=="version")
-        std::cout << "@PROJECT_VERSION@";
+        output += "@PROJECT_VERSION@";
       else if(op.key()=="revision")
-        std::cout << "@PROJECT_GIT_REVISION@";
-      std::cout << " ";
+        output += "@PROJECT_GIT_REVISION@";
+      output += ' ';
     }
-    std::cout << std::endl;
+    if(!output.empty()) {
+      assert(output.back() == ' ');
+      output.pop_back();
+    }
+    std::cout << output << std::endl;
   }
   catch(cxxopts::OptionException const &) {
     std::cout << options.help();
   }
   return EXIT_SUCCESS;
 }