Compile tests in debug mode.

test/Makefile

@@ -1,13 +1,20 @@
 OPENLIBM_HOME=$(abspath ..)
 include ../Make.inc
 
-all: test-double test-float
+all: test-double test-float test-double-system test-float-system
 
 test-double: test-double.c libm-test.c
-	gcc $< -D__BSD_VISIBLE -I ../include -I../src ../libopenlibm.a -o $@
+	$(CC) -g $< -D__BSD_VISIBLE -I ../include -I../src ../libopenlibm.a -o $@
 
 test-float: test-float.c libm-test.c
-	gcc $< -D__BSD_VISIBLE -I ../include -I../src ../libopenlibm.a -o $@
+	$(CC) -g $< -D__BSD_VISIBLE -I ../include -I../src ../libopenlibm.a -o $@
+
+test-double-system: test-double.c libm-test.c
+	$(CC) -g $< -DSYS_MATH_H -lm -o $@
+
+test-float-system: test-float.c libm-test.c
+	$(CC) -g $< -DSYS_MATH_H -lm -o $@
 
 clean:
-	rm -f *~ *# test-double test-float
+	rm -f *~ *# test-double test-float test-double-system test-float-system
+

test/libm-test.c

@@ -116,7 +116,7 @@
 #endif
 
 #include "libm-test-ulps.h"
-#if 0 /* XXX scp XXX */
+#ifdef SYS_MATH_H /* XXX scp XXX */
 #include <complex.h>
 #include <math.h>
 #include <float.h>