/usr/bin/make segmentation fault

Don't know how to debug this and cannot post the Makefile in question but it
last worked in 8.4.  In 11-CURRENT Var_Value appears to return NULL at
/usr/src/contrib/bmake/compat.c:621

  Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), pgn, 0);

which passes the NULL to Var_Set as the second argument (val) where,
eventually, /usr/src/contrib/bmake/var.c:973

  Buf_AddBytes(&v->val, strlen(val), val);

the SEGV is generated in strlen.

Any and all pointers appreciated,
Roger


gdb /usr/bin/make
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Copyright 2004 Free Software Foundation, Inc.
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This GDB was configured as "amd64-marcel-freebsd"...
Core was generated by `make'.
Program terminated with signal 11, Segmentation fault.
#0  0x000000000045a23f in strlen ()
(gdb) bt
#0  0x000000000045a23f in strlen ()
#1  0x0000000000419dda in Var_Set (name=<value optimized out>, val=<value
optimized out>, ctxt=<value optimized out>,
     flags=<value optimized out>) at /usr/src/contrib/bmake/var.c:973
#2  0x0000000000402040 in Compat_Make (gnp=0x800a1c340, pgnp=0x800a1df00)
at /usr/src/contrib/bmake/compat.c:621
#3  0x000000000041eb38 in Lst_ForEachFrom (l=<value optimized out>,
ln=<value optimized out>, proc=0x401f80 <Compat_Make>,
     d=0x800a1df00) at /usr/src/contrib/bmake/lst.lib/lstForEachFrom.c:104
#4  0x0000000000401ff1 in Compat_Make (gnp=0x800a1df00, pgnp=0x800a1e2c0)
at /usr/src/contrib/bmake/compat.c:509
#5  0x000000000041eb38 in Lst_ForEachFrom (l=<value optimized out>,
ln=<value optimized out>, proc=0x401f80 <Compat_Make>,
     d=0x800a1e2c0) at /usr/src/contrib/bmake/lst.lib/lstForEachFrom.c:104
#6  0x0000000000401ff1 in Compat_Make (gnp=0x800a1e2c0, pgnp=0x800a1e200)
at /usr/src/contrib/bmake/compat.c:509
#7  0x000000000041eb38 in Lst_ForEachFrom (l=<value optimized out>,
ln=<value optimized out>, proc=0x401f80 <Compat_Make>,
     d=0x800a1e200) at /usr/src/contrib/bmake/lst.lib/lstForEachFrom.c:104
#8  0x0000000000401ff1 in Compat_Make (gnp=0x800a1e200, pgnp=0x800a1e200)
at /usr/src/contrib/bmake/compat.c:509
#9  0x0000000000402446 in Compat_Run (targs=<value optimized out>) at
/usr/src/contrib/bmake/compat.c:725
#10 0x000000000040c4cb in main (argc=4, argv=<value optimized out>) at
/usr/src/contrib/bmake/main.c:1396
#11 0x000000000040031f in _start ()
#12 0x0000000000000000 in ?? ()