undefined reference to `cfCMYKSetLtDk' -- cannot build it

  CXX      ppd/ppdc-variable.lo
  CXXLD    libppd.la
  CCLD     testppdfile
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCMYKSetLtDk'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFilterUniversal'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFilterGetEnvVar'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCatalogOptionArrayNew'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfRasterPrepareHeader'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFilterImageToPDF'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfNewResolutionArray'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfImageGetWidth'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFilterDataRemoveExt'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfLutNew'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfImageCrop'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfJoinJobOptionsAndAttrs'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCMYKSetBlack'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFilterExternal'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfImageClose'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCopyResolution'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfImageGetColorSpace'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCMYKSetCurve'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCatalogLookUpOption'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFilterAddEnvVar'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFilterPDFToPDF'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFilterChain'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCMYKSetInkLimit'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCMYKNew'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFilterDataGetExt'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFreeResolution'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfImageGetYPPI'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfGenerateSizes'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCUPSLogFunc'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfImageGetRow'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCUPSIsCanceledFunc'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCMYKSetGamma'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfStrFormatd'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfRGBNew'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfImageOpenFP'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfImageGetHeight'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfPDFPages'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCatalogLookUpChoice'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfCatalogLoad'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfJoinResolutionArrays'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfImageGetXPPI'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfIPPResToResolution'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfNewResolution'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfFilterDataAddExt'
/usr/bin/ld: ./.libs/libppd.so: undefined reference to `cfIPPAttrToResolutionArray'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:1250: testppdfile] Error 1
make[2]: Leaving directory '/home/data1/protected/Programming/git/libppd'
make[1]: *** [Makefile:1674: all-recursive] Error 1
make[1]: Leaving directory '/home/data1/protected/Programming/git/libppd'
make: *** [Makefile:972: all] Error 2

Reproduce the failure with make and inspect the testppdfile link step at Makefile:1250, focusing on how ./.libs/libppd.so is linked. Trace where the listed cf* references are expected to come from and verify the build configuration includes them. Done means testppdfile links successfully and make completes without undefined-reference errors.