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/usr/lib/x86_64-linux-gnu/pkgconfig/mpich.pc is in libmpich-dev 3.0.4-6ubuntu1.

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# this gives access to the mpich header files
prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include/mpich

Name: mpich
Description: High Performance and portable MPI
Version: 3.0.4
URL: http://www.mcs.anl.gov/research/projects/mpich
Requires:
Libs:  -Wl,-Bsymbolic-functions -Wl,-z,relro  -L${libdir}  -lmpich -lopa -lmpl  -lrt -lcr -lpthread  
Cflags: -D_FORTIFY_SOURCE=2  -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security  -I${includedir}

# pkg-config does not understand Cxxflags, etc. So we allow users to
# query them using the --variable option

cxxflags=-D_FORTIFY_SOURCE=2  -g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security  -I${includedir}
fflags=-g -O2  -I${includedir}
fcflags=  -I${includedir}