Build ugis on Ubuntu 26.04

Install the compiler and development packages:

sudo apt-get update
sudo apt-get install --yes --no-install-recommends \
  gcc-15 \
  g++-15 \
  make \
  pkg-config \
  qmake6 \
  qt6-base-dev \
  libboost-dev \
  libcurl4-openssl-dev \
  libgdal-dev \
  libjpeg-dev \
  default-libmysqlclient-dev \
  libpng-dev \
  libpq-dev \
  libspatialite-dev \
  libsqlite3-dev \
  libtbb-dev \
  unixodbc-dev \
  xauth \
  xvfb

Configure and build:

cd example/ugis
qmake6 ugis.pro QMAKE_CC=gcc-15 QMAKE_CXX=g++-15
make --jobs=2

Run a ten-second smoke test on a virtual display:

status=0
timeout --kill-after=5s 10s xvfb-run --auto-servernum ./ugis || status=$?
test "$status" -eq 124

Build and run the autonomous tests (no database servers or network access are required):

cd test
make --file=linux.makefile --jobs=2 CXX=g++-15
make --file=linux.makefile test CXX=g++-15

Run the PostgreSQL tests against a local PostGIS-enabled server:

make --file=linux.makefile test-postgres CXX=g++-15 \
  TEST_PASSWORD=Password12! TEST_POSTGRES_HOST=localhost