+char *run_command(const void *ctx, unsigned int *time_ms, const char *fmt, ...);
+char *temp_file(const void *ctx, const char *extension);
+bool move_file(const char *oldname, const char *newname);
+
+/* From compile.c.
+ *
+ * These all compile into a temporary dir, and return the filename.
+ * On failure they return NULL, and errmsg is set to compiler output.
+ */
+/* Compile multiple object files into a single. */
+char *link_objects(const void *ctx, const char *objs, char **errmsg);
+/* Compile a single C file to an object file. Returns errmsg if fails. */
+char *compile_object(const void *ctx, const char *cfile, const char *ccandir,
+ const char *outfile);
+/* Compile and link single C file, with object files, libs, etc. NULL on
+ * success, error output on fail. */
+char *compile_and_link(const void *ctx, const char *cfile, const char *ccandir,
+ const char *objs, const char *extra_cflags,
+ const char *libs, const char *outfile);
+
+/* If keep is false, return a temporary file. Otherwise, base it on srcname */
+char *maybe_temp_file(const void *ctx, const char *extension, bool keep,
+ const char *srcname);
+
+/* Default wait for run_command. Should never time out. */
+extern const unsigned int default_timeout_ms;
+