Thank you for the reply!
Below is the contents of my config file.
#!/usr/bin/python
#
# autogenerated by MRtrix configure script
#
# configure output:
#
# MRtrix build type requested: release version
#
# WARNING: Anaconda removed from PATH to avoid conflicts
#
# Detecting OS: darwin
# OS X deployment target: 10.14
# Looking for compiler [clang++]: Apple LLVM version 10.0.1 (clang-1001.0.46.4)
# Checking for C++11 compliance: ok
# Checking shared library generation: ok
# Detecting pointer size: 64 bit
# Detecting byte order: little-endian
# Checking for variable-length array support: ok
# Checking for non-POD variable-length array support: ok
# Checking for ::max_align_t: 16 bytes
# Checking for std::max_align_t: 16 bytes
# Checking for Eigen3 library: 3.3.7
# Checking for zlib compression library: 1.2.11
# Checking for "JSON for Modern C++" requirements: ok
# Checking for TIFF library: LIBTIFF, Version 4.0.10
# Checking for FFTW library: fftw-3.3.8-sse2-avx
# Checking for Qt moc: moc (version 4.8.7)
# Checking for Qt qmake: qmake (version 4.8.7)
# Checking for Qt rcc: rcc (version 4.8.7)
# Checking for Qt: 4.8.7
PATH = r'/Applications/MRtrix3Tissue/bin:/Library/Frameworks/Python.framework/Versions/2.7/bin:/Users/amos/bin/ants/bin/:/usr/local/fsl/bin:/Users/amos/.local/bin/fmriprep-docker:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Users/amos/.local/bin/fmriprep-docker:/Applications/fmriprep-docker:/Users/amos/.local/bin:/opt/X11/bin:/Users/amos/abin'
obj_suffix = '.o'
exe_suffix = ''
lib_prefix = 'lib'
lib_suffix = '.dylib'
cpp = [ 'clang++', '-c', 'CFLAGS', 'SRC', '-o', 'OBJECT' ]
cpp_flags = [ '-std=c++11', '-DMRTRIX_BUILD_TYPE="release version"', '-DMRTRIX_MACOSX', '-fPIC', '-mmacosx-version-min=10.14', '-DMRTRIX_WORD64', '-DMRTRIX_TIFF_SUPPORT', '-idirafter', '/usr/local/Cellar/libtiff/4.0.10_1/include', '-DEIGEN_FFTW_DEFAULT', '-idirafter', '/usr/local/Cellar/fftw/3.3.8_1/include', '-Wall', '-O3', '-DNDEBUG' ]
ld = [ 'clang++', 'OBJECTS', 'LDFLAGS', '-o', 'EXECUTABLE' ]
ld_flags = [ '-mmacosx-version-min=10.14', '-lz', '-L/usr/local/Cellar/libtiff/4.0.10_1/lib', '-ltiff', '-L/usr/local/Cellar/fftw/3.3.8_1/lib', '-lfftw3' ]
runpath = '-Wl,-rpath,@loader_path/'
ld_enabled = True
ld_lib = [ 'clang++', 'OBJECTS', 'LDLIB_FLAGS', '-o', 'LIB' ]
ld_lib_flags = [ '-dynamiclib', '-install_name', '@rpath/LIBNAME', '-mmacosx-version-min=10.14', '-lz', '-L/usr/local/Cellar/libtiff/4.0.10_1/lib', '-ltiff', '-L/usr/local/Cellar/fftw/3.3.8_1/lib', '-lfftw3' ]
eigen_cflags = [ '-idirafter', '/usr/local/Cellar/eigen/3.3.7/include/eigen3', '-DEIGEN_DONT_PARALLELIZE' ]
moc = 'moc'
rcc = 'rcc'
qt_cflags = [ '-pipe', '-stdlib=libc++', '-mmacosx-version-min=10.9', '-arch', 'x86_64', '-DQT_NO_DEBUG', '-DQT_SVG_LIB', '-DQT_OPENGL_LIB', '-DQT_GUI_LIB', '-DQT_CORE_LIB', '-DQT_SHARED', '-idirafter', '/usr/local/Cellar/qt@4/4.8.7_5/etc/qt4/mkspecs/unsupported/macx-clang-libc++', '-idirafter', '/usr/local/Cellar/qt@4/4.8.7_5/lib/QtCore.framework/Versions/4/Headers', '-idirafter', '/usr/local/Cellar/qt@4/4.8.7_5/lib/QtCore.framework/Versions/4/Headers', '-idirafter', '/usr/local/Cellar/qt@4/4.8.7_5/lib/QtGui.framework/Versions/4/Headers', '-idirafter', '/usr/local/Cellar/qt@4/4.8.7_5/lib/QtGui.framework/Versions/4/Headers', '-idirafter', '/usr/local/Cellar/qt@4/4.8.7_5/lib/QtOpenGL.framework/Versions/4/Headers', '-idirafter', '/usr/local/Cellar/qt@4/4.8.7_5/lib/QtOpenGL.framework/Versions/4/Headers', '-idirafter', '/usr/local/Cellar/qt@4/4.8.7_5/lib/QtSvg.framework/Versions/4/Headers', '-idirafter', '/usr/local/Cellar/qt@4/4.8.7_5/lib/QtSvg.framework/Versions/4/Headers', '-idirafter', '/usr/local/include', '-idirafter', '/System/Library/Frameworks/OpenGL.framework/Headers', '-idirafter', '/System/Library/Frameworks/AGL.framework/Headers/', '-F/usr/local/lib' ]
qt_ldflags = [ '-headerpad_max_install_names', '-stdlib=libc++', '-mmacosx-version-min=10.9', '-arch', 'x86_64', '-F/usr/local/lib', '-L/usr/local/lib', '-framework', 'QtSvg', '-L/usr/local/opt/openssl/lib', '-L/usr/local/Cellar/qt@4/4.8.7_5/lib', '-F/usr/local/Cellar/qt@4/4.8.7_5/lib', '-framework', 'QtGui', '-framework', 'QtCore', '-framework', 'QtOpenGL', '-framework', 'OpenGL', '-framework', 'AGL' ]
nogui = False