diff --git a/lang/basic/lib/atn.c b/lang/basic/lib/atn.c
index 1358e4db2..ca1683e45 100644
--- a/lang/basic/lib/atn.c
+++ b/lang/basic/lib/atn.c
@@ -7,6 +7,7 @@
 
 /* $Header$ */
 
+#define __NO_DEFS
 #include <math.h>
 
 double
diff --git a/lang/basic/lib/exp.c b/lang/basic/lib/exp.c
index c3c2de91c..4b4a1212f 100644
--- a/lang/basic/lib/exp.c
+++ b/lang/basic/lib/exp.c
@@ -7,6 +7,7 @@
 
 /* $Header$ */
 
+#define __NO_DEFS
 #include <math.h>
 
 static double
diff --git a/lang/basic/lib/log.c b/lang/basic/lib/log.c
index 86d1b9b6a..3bc121957 100644
--- a/lang/basic/lib/log.c
+++ b/lang/basic/lib/log.c
@@ -7,6 +7,7 @@
 
 /* $Header$ */
 
+#define __NO_DEFS
 #include <math.h>
 
 double
diff --git a/lang/basic/lib/sin.c b/lang/basic/lib/sin.c
index 8603ea218..32e4a7e7f 100644
--- a/lang/basic/lib/sin.c
+++ b/lang/basic/lib/sin.c
@@ -7,6 +7,7 @@
 
 /* $Header$ */
 
+#define __NO_DEFS
 #include <math.h>
 
 static double
diff --git a/lang/basic/lib/sqt.c b/lang/basic/lib/sqt.c
index 62a3fb3bf..44b79e6a7 100644
--- a/lang/basic/lib/sqt.c
+++ b/lang/basic/lib/sqt.c
@@ -7,6 +7,7 @@
 
 /* $Header$ */
 
+#define __NO_DEFS
 #include <math.h>
 
 #define NITER	5
diff --git a/lang/pc/libpc/atn.c b/lang/pc/libpc/atn.c
index 1358e4db2..eb09b9283 100644
--- a/lang/pc/libpc/atn.c
+++ b/lang/pc/libpc/atn.c
@@ -6,7 +6,7 @@
  */
 
 /* $Header$ */
-
+#define __NO_DEFS
 #include <math.h>
 
 double
@@ -91,7 +91,7 @@ _atn(x)
 	while (x > pr->X) pr++;
 	if (pr != prec) {
 		x = pr->arctan +
-			atan(pr->one_o_x - pr->one_o_xsq_p_1/(pr->one_o_x + x));
+			_atn(pr->one_o_x - pr->one_o_xsq_p_1/(pr->one_o_x + x));
 	}
 	else {
 		double xsq = x*x;
diff --git a/lang/pc/libpc/exp.c b/lang/pc/libpc/exp.c
index 3ad52e640..2fea29932 100644
--- a/lang/pc/libpc/exp.c
+++ b/lang/pc/libpc/exp.c
@@ -6,7 +6,7 @@
  */
 
 /* $Header$ */
-
+#define __NO_DEFS
 #include <math.h>
 #include <pc_err.h>
 extern	_trp();
diff --git a/lang/pc/libpc/log.c b/lang/pc/libpc/log.c
index c3db6e910..bde00a299 100644
--- a/lang/pc/libpc/log.c
+++ b/lang/pc/libpc/log.c
@@ -6,7 +6,7 @@
  */
 
 /* $Header$ */
-
+#define __NO_DEFS
 #include <math.h>
 #include <pc_err.h>
 extern	_trp();
diff --git a/lang/pc/libpc/sin.c b/lang/pc/libpc/sin.c
index ab55c5bfc..cb8a4e030 100644
--- a/lang/pc/libpc/sin.c
+++ b/lang/pc/libpc/sin.c
@@ -7,6 +7,7 @@
 
 /* $Header$ */
 
+#define __NO_DEFS
 #include <math.h>
 
 static double
diff --git a/lang/pc/libpc/sqt.c b/lang/pc/libpc/sqt.c
index 39c06cfcd..7a152d00c 100644
--- a/lang/pc/libpc/sqt.c
+++ b/lang/pc/libpc/sqt.c
@@ -6,7 +6,7 @@
  */
 
 /* $Header$ */
-
+#define __NO_DEFS
 #include <math.h>
 #include <pc_err.h>
 extern	_trp();