+@footnote{In SBCL versions prior to 1.0.13, @code{sb-ext:run-program}
+searched for executables in a manner somewhat incompatible with other
+languages. As of this version, SBCL uses the system library routine
+@code{execvp(3)}, and no longer contains the function,
+@code{find-executable-in-search-path}, which implemented the old
+search. Users who need this function may find it
+in @file{run-program.lisp} versions 1.67 and earlier in SBCL's CVS
+repository here
+@url{http://sbcl.cvs.sourceforge.net/sbcl/sbcl/src/code/run-program.lisp?view=log}. However,
+we caution such users that this search routine finds executables that
+system library routines do not.}