diff -r 3912259ac653 -r 04d1c31f3bae 386/include/ape/math.h
--- a/386/include/ape/math.h	Wed May 23 19:44:12 2018 +0200
+++ b/386/include/ape/math.h	Thu May 24 08:35:01 2018 -0400
@@ -15,6 +15,7 @@
 extern double atan(double);
 extern double atan2(double, double);
 extern double cos(double);
+extern double hypot(double, double);
 extern double sin(double);
 extern double tan(double);
 extern double cosh(double);
@@ -36,6 +37,7 @@
 extern int isNaN(double);
 extern double Inf(int);
 extern int isInf(double, int);
+extern double fmin(double, double);
 
 #ifdef _RESEARCH_SOURCE
 /* does >> treat left operand as unsigned ? */
diff -r 3912259ac653 -r 04d1c31f3bae 68020/include/ape/math.h
--- a/68020/include/ape/math.h	Wed May 23 19:44:12 2018 +0200
+++ b/68020/include/ape/math.h	Thu May 24 08:35:01 2018 -0400
@@ -15,6 +15,7 @@
 extern double atan(double);
 extern double atan2(double, double);
 extern double cos(double);
+extern double hypot(double, double);
 extern double sin(double);
 extern double tan(double);
 extern double cosh(double);
@@ -36,6 +37,7 @@
 extern int isNaN(double);
 extern double Inf(int);
 extern int isInf(double, int);
+extern double fmin(double, double);
 
 #ifdef _RESEARCH_SOURCE
 /* does >> treat left operand as unsigned ? */
diff -r 3912259ac653 -r 04d1c31f3bae amd64/include/ape/math.h
--- a/amd64/include/ape/math.h	Wed May 23 19:44:12 2018 +0200
+++ b/amd64/include/ape/math.h	Thu May 24 08:35:01 2018 -0400
@@ -37,6 +37,7 @@
 extern int isNaN(double);
 extern double Inf(int);
 extern int isInf(double, int);
+extern double fmin(double, double);
 
 #ifdef _RESEARCH_SOURCE
 /* does >> treat left operand as unsigned ? */
diff -r 3912259ac653 -r 04d1c31f3bae arm/include/ape/math.h
--- a/arm/include/ape/math.h	Wed May 23 19:44:12 2018 +0200
+++ b/arm/include/ape/math.h	Thu May 24 08:35:01 2018 -0400
@@ -15,6 +15,7 @@
 extern double atan(double);
 extern double atan2(double, double);
 extern double cos(double);
+extern double hypot(double, double);
 extern double sin(double);
 extern double tan(double);
 extern double cosh(double);
@@ -36,6 +37,7 @@
 extern int isNaN(double);
 extern double Inf(int);
 extern int isInf(double, int);
+extern double fmin(double, double);
 
 #ifdef _RESEARCH_SOURCE
 /* does >> treat left operand as unsigned ? */
diff -r 3912259ac653 -r 04d1c31f3bae mips/include/ape/math.h
--- a/mips/include/ape/math.h	Wed May 23 19:44:12 2018 +0200
+++ b/mips/include/ape/math.h	Thu May 24 08:35:01 2018 -0400
@@ -15,6 +15,7 @@
 extern double atan(double);
 extern double atan2(double, double);
 extern double cos(double);
+extern double hypot(double, double);
 extern double sin(double);
 extern double tan(double);
 extern double cosh(double);
@@ -36,6 +37,7 @@
 extern int isNaN(double);
 extern double Inf(int);
 extern int isInf(double, int);
+extern double fmin(double, double);
 
 #ifdef _RESEARCH_SOURCE
 /* does >> treat left operand as unsigned ? */
diff -r 3912259ac653 -r 04d1c31f3bae power/include/ape/math.h
--- a/power/include/ape/math.h	Wed May 23 19:44:12 2018 +0200
+++ b/power/include/ape/math.h	Thu May 24 08:35:01 2018 -0400
@@ -15,6 +15,7 @@
 extern double atan(double);
 extern double atan2(double, double);
 extern double cos(double);
+extern double hypot(double, double);
 extern double sin(double);
 extern double tan(double);
 extern double cosh(double);
@@ -36,6 +37,7 @@
 extern int isNaN(double);
 extern double Inf(int);
 extern int isInf(double, int);
+extern double fmin(double, double);
 
 #ifdef _RESEARCH_SOURCE
 /* does >> treat left operand as unsigned ? */
diff -r 3912259ac653 -r 04d1c31f3bae sparc/include/ape/math.h
--- a/sparc/include/ape/math.h	Wed May 23 19:44:12 2018 +0200
+++ b/sparc/include/ape/math.h	Thu May 24 08:35:01 2018 -0400
@@ -15,6 +15,7 @@
 extern double atan(double);
 extern double atan2(double, double);
 extern double cos(double);
+extern double hypot(double, double);
 extern double sin(double);
 extern double tan(double);
 extern double cosh(double);
@@ -36,6 +37,7 @@
 extern int isNaN(double);
 extern double Inf(int);
 extern int isInf(double, int);
+extern double fmin(double, double);
 
 #ifdef _RESEARCH_SOURCE
 /* does >> treat left operand as unsigned ? */
diff -r 3912259ac653 -r 04d1c31f3bae sparc64/include/ape/math.h
--- a/sparc64/include/ape/math.h	Wed May 23 19:44:12 2018 +0200
+++ b/sparc64/include/ape/math.h	Thu May 24 08:35:01 2018 -0400
@@ -15,6 +15,7 @@
 extern double atan(double);
 extern double atan2(double, double);
 extern double cos(double);
+extern double hypot(double, double);
 extern double sin(double);
 extern double tan(double);
 extern double cosh(double);
@@ -36,6 +37,7 @@
 extern int isNaN(double);
 extern double Inf(int);
 extern int isInf(double, int);
+extern double fmin(double, double);
 
 #ifdef _RESEARCH_SOURCE
 /* does >> treat left operand as unsigned ? */
diff -r 3912259ac653 -r 04d1c31f3bae sys/src/ape/lib/ap/math/fmin.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/src/ape/lib/ap/math/fmin.c	Thu May 24 08:35:01 2018 -0400
@@ -0,0 +1,11 @@
+#include <math.h>
+
+double
+fmin(double a, double b)
+{
+	if(isNaN(a))
+		return b;
+	if(isNaN(b))
+		return a;
+	return a < b ? a : b;
+}
diff -r 3912259ac653 -r 04d1c31f3bae sys/src/ape/lib/ap/math/mkfile
--- a/sys/src/ape/lib/ap/math/mkfile	Wed May 23 19:44:12 2018 +0200
+++ b/sys/src/ape/lib/ap/math/mkfile	Thu May 24 08:35:01 2018 -0400
@@ -10,6 +10,7 @@
 	fabs.$O\
 	floor.$O\
 	fmod.$O\
+	fmin.$O\
 	gamma.$O\
 	hypot.$O\
 	j0.$O\