FreeBSD 9.0でカーネルモジュールのmakeでこんなエラーになってたんだけど、/usr/src/share/mkでmake installすれば良さげというのが分かったのでやってみたらビルドできた！
"/sys/conf/kmod.mk", line 116: Malformed conditional (${MK_CLANG_IS_CC} == "no"
&& ${CC:T:Mclang} != "clang")
"/sys/conf/kmod.mk", line 120: if-less endif
"/sys/conf/kern.mk", line 18: Malformed conditional (${MK_CLANG_IS_CC} != "no" |
| ${CC:T:Mclang} == "clang")
"/sys/conf/kern.mk", line 32: if-less endif
"/sys/conf/kern.mk", line 102: Malformed conditional (${MK_CLANG_IS_CC} != "no"
|| ${CC:T:Mclang} == "clang")
"/sys/conf/kern.mk", line 108: if-less endif
make: fatal errors encountered -- cannot continue
