diff --git a/lib/descr/ibm.nosid b/lib/descr/ibm.nosid
index c3db4db0..69663317 100644
--- a/lib/descr/ibm.nosid
+++ b/lib/descr/ibm.nosid
@@ -10,6 +10,7 @@ var LIB=mach/i86/lib/tail_
 var LIBIBM=mach/ibm/lib/tail_
 var RT=mach/i86/lib/head_
 var RTIBM=mach/ibm/lib/head_
+var CCP_F=-Dunix
 var INCLUDES=-I{EM}/include -I{EM}/mach/ibm/include
 name be
 	from .m
diff --git a/lib/descr/sat86 b/lib/descr/sat86
index 0e3a8e57..ecfa18d8 100644
--- a/lib/descr/sat86
+++ b/lib/descr/sat86
@@ -10,6 +10,7 @@ var LIB=mach/i86/lib/tail_
 var ALIB=mach/i86/lib/sat_tail_
 var RT=mach/i86/lib/head_
 var ART=mach/i86/lib/sat_head_
+var CCP_F=-Dunix
 var INCLUDES=-I{EM}/include -I/usr/include
 name be
 	from .m
diff --git a/lib/em22/descr b/lib/em22/descr
index dd468fba..cb0eca00 100644
--- a/lib/em22/descr
+++ b/lib/em22/descr
@@ -9,6 +9,7 @@ var NAME=int22
 var LIB=mach/int/lib/tail_
 var RT=mach/int/lib/head_
 var SIZE_FLAG=-sm
+var CCP_F=-Dunix
 var INCLUDES=-I{EM}/include -I/usr/include
 name asld
 	from .k.m.a
diff --git a/lib/m68k2/descr b/lib/m68k2/descr
index bafd025e..96ccdc0f 100644
--- a/lib/m68k2/descr
+++ b/lib/m68k2/descr
@@ -8,6 +8,7 @@ var NAME=m68k2
 var M=m68k2
 var LIB=mach/m68k2/lib/tail_
 var RT=mach/m68k2/lib/head_
+var CCP_F=-Dunix
 var INCLUDES=-I{EM}/include -I/usr/include
 name be
 	from .m
diff --git a/lib/m68k4/descr b/lib/m68k4/descr
index db0b1c0d..4aac96d7 100644
--- a/lib/m68k4/descr
+++ b/lib/m68k4/descr
@@ -9,6 +9,7 @@ var M=m68k4
 var LIBDIR=mach/m68k4/lib
 var LIB=mach/m68k4/lib/tail_
 var RT=mach/m68k4/lib/head_
+var CCP_F=-Dunix
 var INCLUDES=-I{EM}/include -I/usr/include
 name be
 	from .m
diff --git a/lib/pdp/descr b/lib/pdp/descr
index eb99a54a..d44756df 100644
--- a/lib/pdp/descr
+++ b/lib/pdp/descr
@@ -8,6 +8,7 @@ var M=pdp
 var NAME=pdp
 var LIB=mach/pdp/lib/tail_
 var RT=mach/pdp/lib/head_
+var CCP_F=-Dunix
 var INCLUDES=-I{EM}/include -I/usr/include
 name be
 	from .m
diff --git a/lib/pmds/descr b/lib/pmds/descr
index d602a1d6..1402ad45 100644
--- a/lib/pmds/descr
+++ b/lib/pmds/descr
@@ -8,6 +8,7 @@ var NAME=m68k2
 var M=m68k2
 var LIB=mach/m68k2/lib/tail_
 var RT=mach/m68k2/lib/head_
+var CCP_F=-Dunix
 var INCLUDES=-I{EM}/include -I/usr/include
 name be
 	from .m