--- libgfortran/acinclude.m4.orig
+++ libgfortran/acinclude.m4
@@ -85,7 +85,7 @@
 	      [Define to 1 if the target supports #pragma weak])
   fi
   case "$host" in
-    *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | *-*-musl* )
+    *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | *-*-musl* | *-*-netbsd* )
       AC_DEFINE(GTHREAD_USE_WEAK, 0,
 		[Define to 0 if the target shouldn't use #pragma weak])
       ;;
--- libgfortran/configure.orig
+++ libgfortran/configure
@@ -25992,7 +25992,7 @@
 
   fi
   case "$host" in
-    *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | *-*-musl* )
+    *-*-darwin* | *-*-hpux* | *-*-cygwin* | *-*-mingw* | *-*-musl* | *-*-netbsd* )
 
 $as_echo "#define GTHREAD_USE_WEAK 0" >>confdefs.h
 
--- gcc/fortran/f95-lang.c.orig
+++ gcc/fortran/f95-lang.c
@@ -748,10 +748,17 @@
 
   gfc_define_builtin ("__builtin_cabsl", func_clongdouble_longdouble, 
 		      BUILT_IN_CABSL, "cabsl", ATTR_CONST_NOTHROW_LEAF_LIST);
+#if defined(__NetBSD__)
+  gfc_define_builtin ("__builtin_cabs", func_cdouble_double, 
+		      BUILT_IN_CABS, "__c99_cabs", ATTR_CONST_NOTHROW_LEAF_LIST);
+  gfc_define_builtin ("__builtin_cabsf", func_cfloat_float, 
+		      BUILT_IN_CABSF, "__c99_cabsf", ATTR_CONST_NOTHROW_LEAF_LIST);
+#else
   gfc_define_builtin ("__builtin_cabs", func_cdouble_double, 
 		      BUILT_IN_CABS, "cabs", ATTR_CONST_NOTHROW_LEAF_LIST);
   gfc_define_builtin ("__builtin_cabsf", func_cfloat_float, 
 		      BUILT_IN_CABSF, "cabsf", ATTR_CONST_NOTHROW_LEAF_LIST);
+#endif
  
   gfc_define_builtin ("__builtin_copysignl", mfunc_longdouble[1], 
 		      BUILT_IN_COPYSIGNL, "copysignl",