Qmake creating a .pc file - c++

Question

Does anyone know if qmake can create a .pc file? I found someone that said it could here: http://www.qtcentre.org/threads/24422-How-can-we-create-.pc-file-automatically. But I have tried it and got the same results as the person having the issue at the bottom of the thread. I was wondering if someone knew anything about this.
TEMPLATE = lib
TARGET = proc_Model
QT += declarative dbus
CONFIG += qt plugin dbus create_pc
DESTDIR = /usr/lib/
OBJECTS_DIR = .obj
MOC_DIR = .moc
TARGET = $$qtLibraryTarget($$TARGET)
INCLUDEPATH += ../common
# Input
SOURCES += ../common/proc_struct.cpp \
listitem.cpp \
listmodel.cpp \
process.cpp \
proc_if.cpp
HEADERS += ../common/proc_struct.h \
listitem.h \
listmodel.h \
process.h \
proc_if.h
headers.path= /usr/include/proc_Model
headers.files = ../common/proc_struct.h \
listitem.h \
listmodel.h \
process.h \
proc_if.h
target.path = /usr/lib
QMAKE_PKGCONFIG_NAME = proc_Model
QMAKE_PKGCONFIG_DESCRIPTION = Model that emits process info
QMAKE_PKGCONFIG_LIBDIR = $$target.path
QMAKE_PKGCONFIG_INCDIR = $$target.path
QMAKE_PKGCONFIG_DESTDIR = pkgconfig
INSTALLS+=headers target
When I make install, I get the following output:
install -m 755 -p "/usr/lib/libproc_Model.so" "/usr/lib/libproc_Model.so"
install: `/usr/lib/libproc_Model.so' and `/usr/lib/libproc_Model.so' are the same file
make: [install_target] Error 1 (ignored)
strip --strip-unneeded "/usr/lib/libproc_Model.so"
install -m 644 -p "/usr/lib/pkgconfig/proc_Model.pc" "/usr/lib/pkgconfig/proc_Model.pc"
install: cannot stat `/usr/lib/pkgconfig/proc_Model.pc': No such file or directory
make: [install_target] Error 1 (ignored)

Answer 1

According to qmake source code, you have to add:
CONFIG += create_prl no_install_prl
create_pc only adds the rule for the .pc file target to the makefile with the command "qmake -prl" and that command only creates the .pc file if the create_prl option is present.
no_install_prl prevents the unneeded .prl file, generated by create_prl, to be installed in ${target.path}.

Answer 2

I made a complete example here:
https://github.com/pvanhoof/dir-examples/blob/master/qmake-example/src/libs/qmake-example/qmake-example.pro
## We get the PREFIX, MAJOR_VERSION, MINOR_VERSION and PATCH_VERSION
## from this project-wide include
include(../../../qmake-example.pri)
## We will use the standard lib template of qmake
TEMPLATE = lib
## We need to set VERSION to a semver.org version for compile_libtool
VERSION = $${MAJOR_VERSION}"."$${MINOR_VERSION}"."$${PATCH_VERSION}
## According https://autotools.io/libtool/version.html, section 4.3
## we should have as target-name the API version in the library's name
TARGET = qmake-example-$${MAJOR_VERSION}"."$${MINOR_VERSION}
## We will write a define in config.h for access to the semver.org
## version as a double quoted string
QMAKE_SUBSTITUTES += config.h.in
## Our example happens to use QDebug, so we need QtCore here
QT = core
## This is of course optional
CONFIG += c++14
## We will be using libtool style libraries
CONFIG += compile_libtool
CONFIG += create_libtool
## These will create a pkg-config .pc file for us
CONFIG += create_pc create_prl no_install_prl
## Project sources
SOURCES = \
qmake-example.cpp
## Project headers
HEADERS = \
qmake-example.h
## We will install the headers in a API specific include path
headers.path = $${PREFIX}/include/qmake-example-$${MAJOR_VERSION}"."$${MINOR_VERSION}
## Here will go all the installed headers
headers.files = $${HEADERS}
## Here we will install the library to
target.path = $${PREFIX}/lib
## This is the configuration for generating the pkg-config file
QMAKE_PKGCONFIG_NAME = $${TARGET}
QMAKE_PKGCONFIG_DESCRIPTION = An example that illustrates how to do it right with qmake
# This is our libdir
QMAKE_PKGCONFIG_LIBDIR = $$target.path
# This is where our API specific headers are
QMAKE_PKGCONFIG_INCDIR = $$headers.path
QMAKE_PKGCONFIG_DESTDIR = pkgconfig
QMAKE_PKGCONFIG_PREFIX = $${PREFIX}
QMAKE_PKGCONFIG_VERSION = $$VERSION
## Installation targets (the pkg-config seems to install automatically)
INSTALLS += headers target