Error when running ./configure

[thomascoding]

root@ubuntu:~/kal-v0.4.1# ./bootstrap
configure.ac:34: installing ./config.guess' configure.ac:34: installing./config.sub'
configure.ac:4: installing ./install-sh' configure.ac:4: installing./missing'
src/Makefile.am: installing ./depcomp' Makefile.am: installing./INSTALL'

root@ubuntu:~/kal-v0.4.1# CXXFLAGS='-W -Wall -O3' ./configure
...
checking for strtoul... yes
checking for strtol... yes
./configure: line 4896: syntax error near unexpected token FFTW3,' ./configure: line 4896:PKG_CHECK_MODULES(FFTW3, fftw3 >= 3.0)'

[thomascoding]

after installing pkg-config all problems are gone.

[leitao]

I have the same problem, and installing pkg-config and rerunning 'bootstrap' solves the issue.

[saintofinternet]

getting the following error after installing pkg-config....
.....
configure: error: Package requirements (libhackrf) were not met:

No package 'libhackrf' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

Alternatively, you may set the environment variables LIBHACKRF_CFLAGS
and LIBHACKRF_LIBS to avoid the need to call pkg-config.
See the pkg-config man page for more details.

[cslev]

I still have the issue after following this thread...
I have all dependencies installed, all fftw3 and libhackrf libs including reinstalling pkg-config afterward.

./configure: line 5064: syntax error near unexpected token `FFTW3,'
./configure: line 5064: `PKG_CHECK_MODULES(FFTW3, fftw3 >= 3.0)'

If I comment these lines in the configure file, then the line considering similar things with LIBHACKRF below results in a similar error.
Tried to comment PKG_CHECK_MODULES for LIBHACKRF and compile but eventually, of course, it does not find the libs.

The libs installed on my Debian system:

/usr/include/fftw3-mpi.f03
/usr/include/fftw3-mpi.h
/usr/include/fftw3.f
/usr/include/fftw3.f03
/usr/include/fftw3.h
/usr/include/fftw3l-mpi.f03
/usr/include/fftw3l.f03
/usr/include/fftw3q.f03
/usr/lib/i386-linux-gnu/libfftw3.so.3
/usr/lib/i386-linux-gnu/libfftw3.so.3.5.8
/usr/lib/i386-linux-gnu/libfftw3_omp.so.3
/usr/lib/i386-linux-gnu/libfftw3_omp.so.3.5.8
/usr/lib/i386-linux-gnu/libfftw3_threads.so.3
/usr/lib/i386-linux-gnu/libfftw3_threads.so.3.5.8
/usr/lib/x86_64-linux-gnu/cmake/gnuradio/FindFFTW3f.cmake
/usr/lib/x86_64-linux-gnu/libfftw3.a
/usr/lib/x86_64-linux-gnu/libfftw3.so
/usr/lib/x86_64-linux-gnu/libfftw3.so.3
/usr/lib/x86_64-linux-gnu/libfftw3.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3_mpi.a
/usr/lib/x86_64-linux-gnu/libfftw3_mpi.so
/usr/lib/x86_64-linux-gnu/libfftw3_mpi.so.3
/usr/lib/x86_64-linux-gnu/libfftw3_mpi.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3_omp.a
/usr/lib/x86_64-linux-gnu/libfftw3_omp.so
/usr/lib/x86_64-linux-gnu/libfftw3_omp.so.3
/usr/lib/x86_64-linux-gnu/libfftw3_omp.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3_threads.a
/usr/lib/x86_64-linux-gnu/libfftw3_threads.so
/usr/lib/x86_64-linux-gnu/libfftw3_threads.so.3
/usr/lib/x86_64-linux-gnu/libfftw3_threads.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3f.a
/usr/lib/x86_64-linux-gnu/libfftw3f.so
/usr/lib/x86_64-linux-gnu/libfftw3f.so.3
/usr/lib/x86_64-linux-gnu/libfftw3f.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3f_mpi.a
/usr/lib/x86_64-linux-gnu/libfftw3f_mpi.so
/usr/lib/x86_64-linux-gnu/libfftw3f_mpi.so.3
/usr/lib/x86_64-linux-gnu/libfftw3f_mpi.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3f_omp.a
/usr/lib/x86_64-linux-gnu/libfftw3f_omp.so
/usr/lib/x86_64-linux-gnu/libfftw3f_omp.so.3
/usr/lib/x86_64-linux-gnu/libfftw3f_omp.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3f_threads.a
/usr/lib/x86_64-linux-gnu/libfftw3f_threads.so
/usr/lib/x86_64-linux-gnu/libfftw3f_threads.so.3
/usr/lib/x86_64-linux-gnu/libfftw3f_threads.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3l.a
/usr/lib/x86_64-linux-gnu/libfftw3l.so
/usr/lib/x86_64-linux-gnu/libfftw3l.so.3
/usr/lib/x86_64-linux-gnu/libfftw3l.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3l_mpi.a
/usr/lib/x86_64-linux-gnu/libfftw3l_mpi.so
/usr/lib/x86_64-linux-gnu/libfftw3l_mpi.so.3
/usr/lib/x86_64-linux-gnu/libfftw3l_mpi.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3l_omp.a
/usr/lib/x86_64-linux-gnu/libfftw3l_omp.so
/usr/lib/x86_64-linux-gnu/libfftw3l_omp.so.3
/usr/lib/x86_64-linux-gnu/libfftw3l_omp.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3l_threads.a
/usr/lib/x86_64-linux-gnu/libfftw3l_threads.so
/usr/lib/x86_64-linux-gnu/libfftw3l_threads.so.3
/usr/lib/x86_64-linux-gnu/libfftw3l_threads.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3q.a
/usr/lib/x86_64-linux-gnu/libfftw3q.so
/usr/lib/x86_64-linux-gnu/libfftw3q.so.3
/usr/lib/x86_64-linux-gnu/libfftw3q.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3q_omp.a
/usr/lib/x86_64-linux-gnu/libfftw3q_omp.so
/usr/lib/x86_64-linux-gnu/libfftw3q_omp.so.3
/usr/lib/x86_64-linux-gnu/libfftw3q_omp.so.3.5.8
/usr/lib/x86_64-linux-gnu/libfftw3q_threads.a
/usr/lib/x86_64-linux-gnu/libfftw3q_threads.so
/usr/lib/x86_64-linux-gnu/libfftw3q_threads.so.3
/usr/lib/x86_64-linux-gnu/libfftw3q_threads.so.3.5.8
/usr/lib/x86_64-linux-gnu/pkgconfig/fftw3.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/fftw3f.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/fftw3l.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/fftw3q.pc

For libhackrf:

/usr/include/libhackrf
/usr/include/libhackrf/hackrf.h
/usr/lib/udev/rules.d/60-libhackrf0.rules
/usr/lib/x86_64-linux-gnu/SoapySDR/modules0.7/libHackRFSupport.so
/usr/lib/x86_64-linux-gnu/libhackrf.a
/usr/lib/x86_64-linux-gnu/libhackrf.so
/usr/lib/x86_64-linux-gnu/libhackrf.so.0
/usr/lib/x86_64-linux-gnu/libhackrf.so.0.5.0
/usr/lib/x86_64-linux-gnu/pkgconfig/libhackrf.pc
/usr/local/lib/python3.8/dist-packages/urh.libs/libhackrf-a1897859.so.0.5.0

(irrelevant doc and info files are omitted)

Can someone help with this?
Or maybe with how should I adjust the Makefile after removing the lines from configure and trying to set up the libraries manually?

Thanks