heroku-20.config.log

$ vips --vips-version
libvips 8.14.5

$ vips --vips-config
enable debug: false
enable deprecated: true
enable modules: false
enable cplusplus: true
enable RAD load/save: false
enable Analyze7 load/save: false
enable PPM load/save: true
enable GIF load: true
use fftw for FFTs: true
accelerate loops with ORC: true
ICC profile support with lcms: true
zlib: true
text rendering with pangocairo: true
font file support with fontconfig: true
EXIF metadata support with libexif: true
JPEG load/save with libjpeg: true
JXL load/save with libjxl: false (dynamic module: false)
JPEG2000 load/save with OpenJPEG: false
PNG load/save with libspng: true
PNG load/save with libpng: false
selected quantisation package: imagequant
TIFF load/save with libtiff: true
image pyramid save with libgsf: true
HEIC/AVIF load/save with libheif: true (dynamic module: false)
WebP load/save with libwebp: true
PDF load with PDFium: false
PDF load with poppler-glib: true (dynamic module: false)
SVG load with librsvg: true
EXR load with OpenEXR: true
OpenSlide load: false (dynamic module: false)
Matlab load with libmatio: false
NIfTI load/save with niftiio: false
FITS load/save with cfitsio: false
GIF save with cgif: true
selected Magick package: none (dynamic module: false)
Magick API version: none
Magick load: false
Magick save: false