install some scripts even when BUILD_EXECUTABLES=OFF

some scripts do not depend on STIR executables, and are
useful elsewhere.

Fixes #894

scripts/CMakeLists.txt

@@ -1,37 +1,40 @@
 #
 #
 # Copyright 2011-07-01 - 2011 Kris Thielemans
+# Copyright 2022 University College London
 # This file is part of STIR.
 #
 # SPDX-License-Identifier: Apache-2.0
 #
 # See STIR/LICENSE.txt for details
 
-# cmake file declaring all tests in this subdirectory
-
 set(dir scripts)
 
-set(dir_scripts ${dir}_SCRIPTS)
+#set(dir_scripts ${dir}_SCRIPTS)
 
-set(${dir_scripts}
-  stir_subtract 
-  stir_divide 
-  count 
+set(dir_scripts1}
+  stir_subtract
+  stir_divide
   stir_print_voxel_sizes.sh
   estimate_scatter.sh
   zoom_att_image.sh
   get_num_voxels.sh
   create_fdef_from_listmode.sh
+  )
+# scripts that don't use stir utilities and might be useful from python etc
+set(dir_scripts2
+  count 
   force_view_offset_to_zero.sh
   )
 
 
-
 #include(stir_test_exe_targets)
 
 # only install if executables are installed as well, as the scripts need them
 if (BUILD_EXECUTABLES)
-  install(PROGRAMS ${${dir_scripts}} DESTINATION bin)
+  install(PROGRAMS ${dir_scripts1} DESTINATION bin)
 endif()
 
+install(PROGRAMS ${dir_scripts2} DESTINATION bin)
+
 add_subdirectory(IO)

scripts/IO/CMakeLists.txt

@@ -7,7 +7,6 @@
 #
 # See STIR/LICENSE.txt for details
 
-# cmake file declaring all tests in this subdirectory
 
 set(dir scripts_IO)
 
@@ -20,7 +19,5 @@ set(${dir_scripts}
 
 #include(stir_test_exe_targets)
 
-# only install if executables are installed as well, as the scripts need them
-if (BUILD_EXECUTABLES)
-  install(PROGRAMS ${${dir_scripts}} DESTINATION bin)
-endif()
+# These don't need STIR executables, so always install
+install(PROGRAMS ${${dir_scripts}} DESTINATION bin)