search data_dir as well as cache_dir, for MacOS

GNUmakefile.in

@@ -47,9 +47,10 @@ CCP4DIR				= @CCP4@
 CLIBD				= $(CCP4DIR:%=%/lib/data)
 
 CACHE_DIR			= $(DESTDIR)/var/cache/libcifpp
+DATA_DIR			= $(datadir)/libcifpp
 CRON_DIR			= $(DESTDIR)/etc/cron.weekly
 
-DEFINES				+= CACHE_DIR='"$(CACHE_DIR)"'
+DEFINES				+= CACHE_DIR='"$(CACHE_DIR)"' DATA_DIR='"$(DATA_DIR)"'
 
 GNUmakefile: config.status GNUmakefile.in
 	$(SHELL) ./config.status

configure

@@ -8427,6 +8427,8 @@ func_stripname_cnf ()
   esac
 } # func_stripname_cnf
 
+case $host in #(
+  *-apple-*) :
 
 
 
@@ -16066,6 +16068,11 @@ ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
 # Only expand once:
 
+ ;; #(
+  *) :
+
+ ;;
+esac
 
 
 

configure.ac

@@ -52,9 +52,12 @@ dnl AC_MSG_RESULT(ok)
 
 AC_PROG_INSTALL
 
-dnl Shared libraries are not convenient, esp. on MacOS... sigh
-dnl LT_INIT
-LT_INIT([disable-shared])
+dnl disable shared libraries on MacOS... sigh
+AS_CASE([$host],
+	[*-apple-*], [LT_INIT([disable-shared])],
+	[LT_INIT]
+)
+
 AC_SUBST(LIBTOOL_DEPS)
 
 dnl versioning, first for libtool

src/CifUtils.cpp

@@ -1171,9 +1171,20 @@ std::unique_ptr<std::istream> loadResource(std::filesystem::path name)
 	std::unique_ptr<std::istream> result;
 
 	fs::path p = name;
+
 	if (not fs::exists(p))
-		p = fs::path(CACHE_DIR) / p;
-	
+	{
+		for (const char* dir: { CACHE_DIR, DATA_DIR })
+		{
+			auto p2 = fs::path(dir) / p;
+			if (fs::exists(p2))
+			{
+				swap(p, p2);
+				break;
+			}
+		}
+	}
+
 	if (fs::exists(p))
 	{
 		std::unique_ptr<std::ifstream> file(new std::ifstream(p));