--- a/tools-for-build/where-is-mcontext.c
+++ b/tools-for-build/where-is-mcontext.c
@@ -12,7 +12,7 @@
  * While most of SBCL is derived from the CMU CL system, many
  * utilities for the build process (like this one) were written from
  * scratch after the fork from CMU CL.
- * 
+ *
  * This software is in the public domain and is provided with
  * absolutely no warranty. See the COPYING and CREDITS files for
  * more information.
@@ -23,25 +23,25 @@
 #include <sys/ucontext.h>
 
 int main (int argc, char *argv[]) {
-    
+
     if(argc != 1) {
-	fprintf(stderr,"%s: command line arguments provided.  Don't do that.\n", argv[0]);
-	exit(1);
+        fprintf(stderr,"%s: command line arguments provided.  Don't do that.\n", argv[0]);
+        exit(1);
     }
-    
+
     printf("\
 /* This is an automatically-generated file; please do not edit it.\n\
    See the program tools-for-build/where-is-mcontext.c.\n\
  */\n\n");
-    
+
     printf("\
 #ifndef PPC_LINUX_MCONTEXT_H\n\
 #define PPC_LINUX_MCONTEXT_H\n\n");
 
     if (offsetof(ucontext_t,uc_mcontext) > 40) {
-	printf("#define GLIBC232_STYLE_UCONTEXT\n\n");
+        printf("#define GLIBC232_STYLE_UCONTEXT\n\n");
     } else {
-	printf("#define GLIBC231_STYLE_UCONTEXT\n\n");
+        printf("#define GLIBC231_STYLE_UCONTEXT\n\n");
     }
     printf("\
 #endif /* PPC_LINUX_MCONTEXT_H */\n");