Don't set install path in project file

debian/changelog

@@ -1,5 +1,11 @@
-nymea-mqtt (0.1.0) UNRELEASED; urgency=medium
+nymea-mqtt (0.1.1) UNRELEASED; urgency=medium
+
+  * Bugfix release
+
+ -- Michael Zanetti <michael.zanetti@guh.io>  Fri, 12 Apr 2019 21:55:35 +0200
+
+nymea-mqtt (0.1.0) bionic; urgency=medium
 
   * Initial release. 
 
- -- Michael Zanetti <michael.zanetti@guh.io>  Tue, 13 Nov 2018 01:04:13 +0100
+ -- Michael Zanetti <michael.zanetti@guh.io>  Fri, 12 Apr 2019 21:55:31 +0200

debian/libnymea-mqtt-dev.install.in

@@ -1,2 +1,2 @@
-usr/lib/@DEB_HOST_MULTIARCH@/libnymea-mqtt.so
+usr/lib/libnymea-mqtt.so usr/lib/@DEB_HOST_MULTIARCH@/
 usr/include/nymea-mqtt/

debian/libnymea-mqtt.install.in

@@ -1,3 +1,3 @@
-usr/lib/@DEB_HOST_MULTIARCH@/libnymea-mqtt.so.1
-usr/lib/@DEB_HOST_MULTIARCH@/libnymea-mqtt.so.1.0
-usr/lib/@DEB_HOST_MULTIARCH@/libnymea-mqtt.so.1.0.0
+usr/lib/libnymea-mqtt.so.1 usr/lib/@DEB_HOST_MULTIARCH@/
+usr/lib/libnymea-mqtt.so.1.0 usr/lib/@DEB_HOST_MULTIARCH@/
+usr/lib/libnymea-mqtt.so.1.0.0 usr/lib/@DEB_HOST_MULTIARCH@/

libnymea-mqtt/libnymea-mqtt.pri

@@ -1,19 +1,17 @@
-TARGET = nymea-mqtt
+# Include this file in your project if you want to 
+# statically link to libnymea-mqtt
 
 QT -= gui
 QT += network
 
-CONFIG += c++11 console static shared
+CONFIG += c++11 console static
 CONFIG -= app_bundle
 
-target.path = /usr/lib/$$system('dpkg-architecture -q DEB_HOST_MULTIARCH')
-INSTALLS += target
-
 SOURCES += \
     mqttserver.cpp \
     mqttpacket.cpp \
     mqttsubscription.cpp \
-    $$PWD/mqttclient.cpp
+    mqttclient.cpp
 
 PRIVATE_HEADERS = \
     mqttpacket_p.h \

libnymea-mqtt/libnymea-mqtt.pro

@@ -3,6 +3,15 @@ TARGET = nymea-mqtt
 
 include(libnymea-mqtt.pri)
 
+# The .pri is made for other projects to include it in a static manner
+# Change it to build a shared lib here.
+CONFIG -= static
+CONFIG += shared
+
+# install lib
+target.path = /usr/lib
+INSTALLS += target 
+
 # install headers
 pubheaders.files += $$PUBLIC_HEADERS
 pubheaders.path = /usr/include/nymea-mqtt/