Make qmake project file more generic.

It is now possible to override the default locations hard coded in
this file with local preferences.

The variables that can be overridden are HAMLIB_DIR and DESTDIR.

To override, add local variable assignments on the intial qmake
command line. E.g.:

qmake HAMLIB_DIR=c:\my\local\hamlib\installation DESTDIR=c:\my\local\install\destination



git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@4141 ab8295b8-cf94-4d9e-aec4-7959e3be5d79

mainwindow.cpp

@@ -1,4 +1,4 @@
-//--------------------------------------------------------- MainWindow
+//-------------------------------------------------------- MainWindow
 
 #include "mainwindow.h"
 

wsjtx.pro

@@ -10,13 +10,19 @@ CONFIG   += thread
 #CONFIG   += console
 
 TARGET = wsjtx
-DESTDIR = ../wsjtx_install
 VERSION = 1.4
 TEMPLATE = app
 DEFINES = QT5
-HAMLIB_DIR = ../../hamlib3/mingw32
 QMAKE_CXXFLAGS += -std=c++11
 
+isEmpty (DESTDIR) {
+DESTDIR = ../wsjtx_install
+}
+
+isEmpty (HAMLIB_DIR) {
+HAMLIB_DIR = ../../hamlib3/mingw32
+}
+
 F90 = gfortran
 gfortran.output = ${QMAKE_FILE_BASE}.o
 gfortran.commands = $$F90 -c -O2 -o ${QMAKE_FILE_OUT} ${QMAKE_FILE_NAME}
@@ -119,7 +125,7 @@ LIBS += -lfftw3f $$system($$F90 -print-file-name=libgfortran.so)
 
 win32 {
 INCLUDEPATH += $${HAMLIB_DIR}/include
-LIBS += -L${HAMLIB_DIR}/lib -lhamlib
+LIBS += -L$${HAMLIB_DIR}/lib -lhamlib
 LIBS += -L./lib -lastro -ljt9
 LIBS += -L. -lfftw3f_win
 LIBS += -lws2_32