Adjust autoconf files for macOS

Makefile.am

@@ -29,6 +29,10 @@ AM_CFLAGS += -std=c99 -DSQLITE_THREADSAFE=1 -DSQLITE_DQS=0 -DSQLITE_MAX_ATTACHED
 
 AM_LDFLAGS = -pthread -ldl -lm
 
+if HOST_OSX
+AM_LDFLAGS += -framework Security
+endif
+
 LDADD = lib@WXSQLITE3_LIBNAME@.la $(WX_LIBS)
 
 # Define the directory where the library headers are installed.
@@ -71,6 +75,10 @@ samples_minimal_SOURCES = \
 
 samples_minimal_LDFLAGS = -no-install
 
+if HOST_OSX
+samples_minimal_LDFLAGS += -framework Security
+endif
+
 samples_treeview_treeview_SOURCES = \
     samples/treeview/foldertree.cpp \
     samples/treeview/projectlist.cpp \
@@ -84,3 +92,7 @@ samples_treeview_treeview_SOURCES = \
 samples_treeview_treeview_LDADD = $(WX_LIBS_TREEVIEW_SAMPLE) $(LDADD)
 
 samples_treeview_treeview_LDFLAGS = -no-install
+
+if HOST_OSX
+samples_treeview_treeview_LDFLAGS += -framework Security
+endif

configure.ac

@@ -160,5 +160,31 @@ AS_CASE([$host_cpu],
 AM_CONDITIONAL([HOST_X86], [test x$hostX86 = xtrue])
 AM_CONDITIONAL([HOST_ARM], [test x$hostARM = xtrue])
 
+dnl Detect the target system
+
+build_linux=no
+build_windows=no
+build_mac=no
+
+case "${host_os}" in
+    linux*)
+        build_linux=yes
+        ;;
+    cygwin*|mingw*)
+        build_windows=yes
+        ;;
+    darwin*)
+        build_mac=yes
+        ;;
+    *)
+        AC_MSG_ERROR(["OS $host_os is not supported"])
+        ;;
+esac
+
+dnl Pass the conditionals to automake
+AM_CONDITIONAL([HOST_LINUX], [test "$build_linux" = "yes"])
+AM_CONDITIONAL([HOST_WINDOWS], [test "$build_windows" = "yes"])
+AM_CONDITIONAL([HOST_OSX], [test "$build_mac" = "yes"])
+
 AC_CONFIG_FILES([Makefile wxsqlite3.pc])
 AC_OUTPUT