blas-netlib.pc lies about libdir

$ cat /usr/lib/pkgconfig/blas-netlib.pc
prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: blas
Description: The BLAS Basic Linear Algebra Subroutines library
Version: 1.2.20110419
Libs: -L${libdir} -lblas
CFlags: -I${includedir}

Seems like libblas.so placed in /usr/lib/libblas.so
But

$ dpkg -L libblas-dev
/.
/usr
/usr/lib
/usr/lib/pkgconfig
/usr/lib/pkgconfig/blas-netlib.pc
/usr/lib/libblas
/usr/lib/libblas/libblas.a
/usr/include
/usr/include/cblas.h
/usr/include/cblas_f77.h
/usr/share
/usr/share/doc
/usr/share/doc/libblas-dev
/usr/share/doc/libblas-dev/copyright
/usr/lib/libblas/libblas.so
/usr/share/doc/libblas-dev/changelog.Debian.gz

and the /usr/lib/libblas.so is simlink to /etc/alternatives/libblas.so which also may point to /usr/lib/openblas-base/libblas.so

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: libblas-dev 1.2.20110419-10
ProcVersionSignature: Ubuntu 4.2.0-16-generic
Uname: Linux 4.2.3custombuild x86_64
ApportVersion: 2.19.1-0ubuntu4
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Nov 11 11:00:07 2015
Dependencies:
 gcc-5-base 5.2.1-22ubuntu2
 libblas-common 1.2.20110419-10
 libblas3 1.2.20110419-10
 libc6 2.21-0ubuntu4
 libgcc1 1:5.2.1-22ubuntu2
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-09-17 (419 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140916)
SourcePackage: blas
SystemImageInfo: Error: command ['system-image-cli', '-i'] failed with exit code 2:
UpgradeStatus: Upgraded to wily on 2015-10-15 (26 days ago)