Add -lrt, fixes build on ArchLinux

source/backend/standalone/Makefile

@@ -80,6 +80,7 @@ LINK_FLAGS += $(shell pkg-config --libs ntk ntk_images)
 endif
 endif
 
+EXTRA_LIBS  = -ldl -lrt
 LINK_FLAGS += $(EXTRA_LIBS)
 
 # --------------------------------------------------------------

source/bridges/Makefile

@@ -57,7 +57,7 @@ endif
 POSIX_BUILD_FLAGS   = $(BUILD_PLUGIN_FLAGS)
 POSIX_32BIT_FLAGS   = $(32BIT_FLAGS) -L/usr/lib32 -L/usr/lib/i386-linux-gnu
 POSIX_64BIT_FLAGS   = $(64BIT_FLAGS) -L/usr/lib64 -L/usr/lib/x86_64-linux-gnu
-POSIX_LINK_FLAGS    = $(LINK_PLUGIN_FLAGS) $(shell pkg-config --libs jack) -ldl
+POSIX_LINK_FLAGS    = $(LINK_PLUGIN_FLAGS) -ldl -lrt
 
 # --------------------------------------------------------------
 # Plugin bridges (Windows)