Issue #15015 has been reported by hsbt (Hiroshi SHIBATA).

----------------------------------------
Bug #15015: Build failure from `git clone`
https://bugs.ruby-lang.org/issues/15015

* Author: hsbt (Hiroshi SHIBATA)
* Status: Assigned
* Priority: Normal
* Assignee: k0kubun (Takashi Kokubun)
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
I got build failure related mjit header.

```
chkbuild002% make
	BASERUBY = /usr/local/bin/ruby --disable=gems
	CC = cc
	LD = ld
	LDSHARED = cc -shared
	CFLAGS = -O3 -ggdb3 -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wno-tautological-compare -Wno-parentheses-equality -Wno-constant-logical-operand -Wno-self-assign -Wunused-variable -Werror=implicit-int -Werror=pointer-arith -Werror=write-strings -Werror=declaration-after-statement -Werror=shorten-64-to-32 -Werror=implicit-function-declaration -Werror=division-by-zero -Werror=deprecated-declarations -Wno-overlength-strings -Wmissing-noreturn -Werror=extra-tokens -std=gnu99 
	XCFLAGS = -D_FORTIFY_SOURCE=2 -fstack-protector -fno-strict-overflow -DRUBY_DEVEL=1 -fvisibility=hidden -DRUBY_EXPORT -fPIE -DCANONICALIZATION_FOR_MATHN
	CPPFLAGS =   -I. -I.ext/include/x86_64-freebsd11.2 -I./include -I. -I./enc/unicode/10.0.0 
	DLDFLAGS = -Wl,-soname,showflags -fstack-protector -pie  
	SOLIBS = -lelf -lexecinfo -lprocstat -lthr -lrt -lrt -ldl -lcrypt -lm
	LANG = en_US.UTF-8
	LC_ALL = 
	LC_CTYPE = 
FreeBSD clang version 6.0.0 (tags/RELEASE_600/final 326565) (based on LLVM 6.0.0)
Target: x86_64-unknown-freebsd11.2
Thread model: posix
InstalledDir: /usr/bin
translating probes probes.d
generating id.h
id.h updated
generating insns.inc
generating insns_info.inc
/usr/local/bin/ruby --disable=gems ./tool/gen_dummy_probes.rb ./probes.d > probes.dmyh
generating vm.inc
generating vm_call_iseq_optimized.inc
generating vmtc.inc
compiling vm.c
building rb_mjit_header.h
rb_mjit_header.h updated
./tool/ifchange: cannot create .ext/.timestamp/rb_mjit_header.time: No such file or directory
*** Error code 2
```

I manually create `mkdir -p .ext/.timestamp`. After that, it works.



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