can't find qwt header files -- qwt is manually installed after qt5 has been installed

My qwt-6.1.0-rc3 has been successfully installed under /opt/qwt-6.1.0-rc3/ .
and, I'd love to build a static library "qtviews".

1) qtviews.pro is

Quote:

---

TARGET = qtviews
TEMPLATE = lib
CONFIG += qt warn_on debug staticlib
QT += widgets

DEFINES += QTVIEWS_LIBRARY

SOURCES += \
src/VO_DataPlot.cpp

HEADERS += \
include/VO_DataPlot.h \
include/qtviews_global.h

INCLUDEPATH += $QWTDIR/include \
$QTDIR/include \
include \

FORMS += \
ui/distance.ui


DESTDIR = ../../Output/libs/MyQtGui

MOC_DIR = ../../Output/mocs

OBJECTS_DIR = ../../Output/objs/

symbian {
MMP_RULES += EXPORTUNFROZEN
TARGET.UID3 = 0xED588A81
TARGET.CAPABILITY =
TARGET.EPOCALLOWDLLDATA = 1
addFiles.sources = qtviews.dll
addFiles.path = !:/sys/bin
DEPLOYMENT += addFiles
}

unix:!symbian {
maemo5 {
target.path = /opt/usr/lib
} else {
target.path = /usr/lib
}
INSTALLS += target
}

---

2) and,

Quote:

---

$ echo $QWTDIR
/opt/qwt-6.1.0-rc3

---

3)

Quote:

---

/opt/qwt-6.1.0-rc3/include$ ls -l qwt.h
-rw-r--r-- 1 root root 511 Jan 25 16:21 qwt.h

---

4) in src/VO_DataPlot.cpp

Code:

---

#include <QtWidgets/QFileDialog>
#include <stdlib.h>
#include <qimagewriter.h>
#include "qwt.h"
#include "qwt_painter.h"
#include "VO_DataPlot.h"

---

Whenever I tried to build qtviews (make after qmake, which is after make distclean) I still get the following error:

Quote:

---

src/VO_DataPlot.cpp:37:17: fatal error: qwt.h: No such file or directory
compilation terminated.
make: *** [../../Output/objs/VO_DataPlot.o] Error 1

---

It looks like INCLUDEPATH += $QWTDIR/include \ doesn't work at all...


Please help. Thank you..


Best Regards
Pei

Try to add qwt lib by this way:first of all right click on project root in qtcreator then go to add Library. Do this to see if issue resolves...

Read the INSTALL file and after understanding about qmake features and how they are found use "CONFIG += qwt".

Uwe

Thank you Uwe.
This problem solved.
I do need to define an environment variable QMAKEFEATURES


However, after a thoroughly refresh build, my program is still not able to run, please refer to
http://www.qtcentre.org/threads/5340...ht=#post239359

Namely, I kept obtaining the error message:

Quote:

---

QMetaType::registerType: Binary compatibility break -- Size mismatch for type 'QPaintBufferCacheEntry' [1024]. Previously registered size 0, now registering size 12.
Aborted (core dumped)

---

Cheers
Pei