diff --git a/configure/os/CONFIG.Common.darwin-ppc b/configure/os/CONFIG.Common.darwin-ppc
index e80b3149f..3ce4c604f 100644
--- a/configure/os/CONFIG.Common.darwin-ppc
+++ b/configure/os/CONFIG.Common.darwin-ppc
@@ -28,16 +28,24 @@ OP_SYS_CFLAGS += -fno-common
 CPPSNCFLAGS += -no-cpp-precomp
 
 #
-# The following two definitions enable the use of DarwinPorts packages.
+# Darwin os definition
 #
-OP_SYS_CPPFLAGS += -I/opt/local/include
-OP_SYS_LDFLAGS += -L/opt/local/lib
+OP_SYS_CPPFLAGS += -Ddarwin
+
+#
+# The following two definitions enable the use of DarwinPorts packages.
+
+#
+OP_SYS_INCLUDES += -I/opt/local/include
+# dir/firstword/wildcard used to avoid warning -L: directory name (...) does not exist
+OP_SYS_LDFLAGS +=  $(addprefix -L,$(dir $(firstword $(wildcard /opt/local/lib/*))))
 
 #
 # The following two definitions enable the use of Fink packages.
 #
-OP_SYS_CPPFLAGS += -I/sw/include
-OP_SYS_LDFLAGS += -L/sw/lib
+OP_SYS_INCLUDES += -I/sw/include
+# dir/firstword/wildcard used to avoid warning -L: directory name (...) does not exist
+OP_SYS_LDFLAGS +=  $(addprefix -L,$(dir $(firstword $(wildcard /sw/lib/*))))
 
 #
 # Libraries for command-line editing.
diff --git a/configure/os/CONFIG_SITE.Common.darwin-ppc b/configure/os/CONFIG_SITE.Common.darwin-ppc
index 3abffa89a..8d65d3187 100644
--- a/configure/os/CONFIG_SITE.Common.darwin-ppc
+++ b/configure/os/CONFIG_SITE.Common.darwin-ppc
@@ -9,4 +9,6 @@
 #
 # Other local options
 #
-OP_SYS_CFLAGS += -g
+OPT_CFLAGS_YES += -g
+OPT_CXXFLAGS_YES += -g
+COMMANDLINE_LIBRARY = READLINE