PKG_PROG_PKG_CONFIG: command not found

I check the path of pkg.m4.the result is

Code:

$ aclocal --print-ac-dir
/usr/share/aclocal

I search pkg.m4,run command

Code:

$ find /usr -name pkg.m4
/usr/share/aclocal/pkg.m4

the two results is consistent.

I run

Code:

$ pkg-config --version
0.29.2

and

Code:

$ pkg-config --modversion ibus-table
1.9.14

,which are right work.

The pkg-config is compile,install by local.

Code:

./configure --prefix=/usr
make
make install

so

Code:

$dpkg -l pkg-config
un  pkg-config

the result show UN.

how to fix PKG_PROG_PKG_CONFIG error?thx