--- runtime/Clib/cports.c.orig	2022-12-29 23:55:22.000000000 -0700
+++ runtime/Clib/cports.c	2023-01-10 10:14:53.442758400 -0700
@@ -158,7 +158,7 @@ static int posix_close(FILE *f) {
 }
 
 static ssize_t posix_read(FILE *f, void *buf, size_t count) {
-   int n = fread(buf, 1, count, f);
+   size_t n = fread(buf, 1, count, f);
 
    if (n != 0)
       return n;
@@ -174,9 +174,9 @@ static ssize_t posix_read(FILE *f, void
 /*    BSD compatibility kit                                            */
 /*---------------------------------------------------------------------*/
 #if (BGL_HAVE_SENDFILE && (BGL_SENDFILE_BRAND == BGL_SENDFILE_BSD))
-static int bsd_sendfile(int out_fd, int in_fd, off_t *offset, size_t count) {
-   off_t sz = count;
-   int n = sendfile(in_fd, out_fd, offset ? *offset : 0, &sz, 0, 0);
+static ssize_t bsd_sendfile(int out_fd, int in_fd, off_t *offset, size_t count) {
+   ssize_t sz = count;
+   ssize_t n = sendfile(in_fd, out_fd, offset ? *offset : 0, &sz, 0, 0);
 
    return n ? n : sz;
 }
@@ -2296,7 +2296,7 @@ bgl_file_to_string(char *path) {
 	 return 0L;
       } else {
 	 obj_t res = make_string_sans_fill(sin.st_size);
-	 int n = read(fd, BSTRING_TO_STRING(res), sin.st_size);
+	 ssize_t n = read(fd, BSTRING_TO_STRING(res), sin.st_size);
 
 	 close(fd);
 	 
@@ -2585,7 +2585,7 @@ bgl_sendchars(obj_t ip, obj_t op, long s
       }
 #if (BGL_HAVE_SENDFILE)
    } else {
-      if (sz == -1) sz = in.st_size;
+      if (sz == -1) sz = (long) in.st_size;
 
       if (sz != 0) {
 #if (BGL_GC_HAVE_BLOCKING)
@@ -2695,7 +2695,7 @@ bgl_sendfile(obj_t name, obj_t op, long
 	 C_SYSTEM_FAILURE(
 	    BGL_IO_PORT_ERROR, "send-file", strerror(errno), name);
       }
-      sz = sin.st_size;
+      sz = (long) sin.st_size;
    }
 
 #if (!BGL_HAVE_SENDFILE)