--- a/js/src/old-configure.in
+++ b/js/src/old-configure.in
@@ -1746,19 +1746,16 @@ ia64*-hpux*)
        LDFLAGS="$LDFLAGS -Wl,-z,ignore -Wl,-R,'\$\$ORIGIN:\$\$ORIGIN/..' -Wl,-z,lazyload -Wl,-z,combreloc -Wl,-z,muldefs"
        LIBS="-lc $LIBS"
        ASFLAGS="$ASFLAGS -fPIC"
        DSO_LDOPTS='-shared'
        WARNINGS_AS_ERRORS='-Werror'
        _WARNINGS_CFLAGS=''
        _WARNINGS_CXXFLAGS=''
     fi
-    if test "$OS_RELEASE" = "5.5.1"; then
-        AC_DEFINE(NEED_USLEEP_PROTOTYPE)
-    fi
     ;;
 
 *-sunos*)
     DSO_LDOPTS='-Bdynamic'
     MKSHLIB='-$(LD) $(DSO_LDOPTS) -o $@'
     MKCSHLIB='-$(LD) $(DSO_LDOPTS) -o $@'
     AC_DEFINE(SUNOS4)
     AC_DEFINE(SPRINTF_RETURNS_STRING)

--- a/old-configure.in
+++ b/old-configure.in
@@ -2347,19 +2347,16 @@ ia64*-hpux*)
        LDFLAGS="$LDFLAGS -Wl,-z,ignore -Wl,-R,'\$\$ORIGIN:\$\$ORIGIN/..' -Wl,-z,lazyload -Wl,-z,combreloc -Wl,-z,muldefs"
        LIBS="-lc $LIBS"
        ASFLAGS="$ASFLAGS -fPIC"
        DSO_LDOPTS='-shared'
        WARNINGS_AS_ERRORS='-Werror'
        _WARNINGS_CFLAGS=''
        _WARNINGS_CXXFLAGS=''
     fi
-    if test "$OS_RELEASE" = "5.5.1"; then
-        AC_DEFINE(NEED_USLEEP_PROTOTYPE)
-    fi
     ;;
 
 *-sunos*)
     DSO_LDOPTS='-Bdynamic'
     MKSHLIB='-$(LD) $(DSO_LDOPTS) -o $@'
     MKCSHLIB='-$(LD) $(DSO_LDOPTS) -o $@'
     AC_DEFINE(SUNOS4)
     AC_DEFINE(SPRINTF_RETURNS_STRING)