https://bugs.gentoo.org/968162

diff --git a/tools/defcheck.py b/tools/defcheck.py
index 3103481..30d875f 100644
--- a/tools/defcheck.py
+++ b/tools/defcheck.py
@@ -31,7 +31,7 @@ Needs the tool "nm" to work
 
 import sys, subprocess
 
-from os import path
+from os import getenv, path
 
 def_files = sys.argv[1:]
 
@@ -65,7 +65,7 @@ for df in def_files:
    #      unsortindex = i+1
    #      break;
 
-   status, nm = subprocess.getstatusoutput ("nm --defined-only --extern-only " +
+   status, nm = subprocess.getstatusoutput (getenv("NM", default="nm") + " --defined-only --extern-only " +
                                             libname)
    if status != 0:
       print("trouble reading {} - has it been compiled?".format(libname))