Compiling --enable-pdfium fails

Hello,

for 6.0.3.2 I call
  ./configure --enable-evolution2 --enable-avahi  
--enable-python=system --enable-eot --enable-online-update  
--enable-introspection=yes --without-doxygen --with-jdk-home=/opt/jdk  
--with-ant-home=/opt/ant --without-junit --enable-formula-logger  
--enable-introspection --with-system-bzip2 --with-system-cairo  
--with-system-epoxy --with-system-zlib --with-system-jpeg  
--with-system-expat --with-system-libxml --with-system-icu  
--with-system-openldap --with-system-poppler --with-system-curl  
--with-system-boost --with-webdav --with-krb5 --with-gssapi  
--with-system-lcms2 --with-boost --with-system-nss  
--with-system-graphite --with-system-harfbuzz --with-system-openssl  
--with-system-libpng --disable-firebird-sdbc


which implies --enable-pdfium, and then `make` shows:

mkdir -p /src/libreoffice-6.0.3.2/instdir
/src/libreoffice-6.0.3.2/solenv/bin/install-gdb-printers -a  
/src/libreoffice-6.0.3.2/instdir -c
make -j 4  -rs -f /src/libreoffice-6.0.3.2/Makefile.gbuild    all
[build DEP] LNK:Executable/unoidl-write
[build DEP] LNK:Executable/unoidl-check
[build DEP] LNK:Library/libunoidllo.so
[build DEP] LNK:Library/libpdfiumlo.so
[build DEP] LNK:Executable/cppumaker
[build PAT] liborcus
[build DEP] LNK:Library/libunoidllo.so
[build LNK] Library/libunoidllo.so
[build UIC] modules/BasicIDE
[build CXX]  
workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp
/src/libreoffice-6.0.3.2/workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp: In function ‘boolean  
_src_fill_buffer(j_decompress_ptr)’:
/src/libreoffice-6.0.3.2/workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp:78:10: error: invalid conversion from ‘int’ to ‘boolean’  
[-fpermissive]
   return 0;
          ^
/src/libreoffice-6.0.3.2/workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp: In function ‘boolean _src_resync(j_decompress_ptr,  
int)’:
/src/libreoffice-6.0.3.2/workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp:82:10: error: invalid conversion from ‘int’ to ‘boolean’  
[-fpermissive]
   return 0;
          ^
/src/libreoffice-6.0.3/workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp: In function ‘bool JpegLoadInfo(const uint8_t*, uint32_t, int*, int*, int*, int*,  
bool*)’:
/src/libreoffice-6.0.3/workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp:151:42: error: cannot convert ‘bool’ to ‘boolean’ for argument ‘2’ to ‘int jpeg_read_header(j_decompress_ptr,  
boolean)’
   int ret = jpeg_read_header(&cinfo, true);
                                          ^
/src/libreoffice-6.0.3/workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp: In member function ‘bool  
CCodec_JpegDecoder::InitDecode()’:
/src/libreoffice-6.0.3/workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp:235:42: error: cannot convert ‘bool’ to ‘boolean’ for argument ‘2’ to ‘int jpeg_read_header(j_decompress_ptr,  
boolean)’
   int ret = jpeg_read_header(&cinfo, true);
                                          ^
/src/libreoffice-6.0.3.2/workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp: In member function ‘int CCodec_JpegModule::ReadHeader(CCodec_JpegModule::Context*, int*, int*,  
int*)’:
/src/libreoffice-6.0.3.2/workdir/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.cpp:463:48: error: cannot convert ‘bool’ to ‘boolean’ for argument ‘2’ to ‘int jpeg_read_header(j_decompress_ptr,  
boolean)’
   int ret = jpeg_read_header(&ctx->m_Info, true);
                                                ^
make[1]: ***  
[/src/libreoffice-6.0.3.2/solenv/gbuild/LinkTarget.mk:340:  
/src/libreoffice-6.0.3.2/workdir/GenCxxObject/UnpackedTarball/pdfium/core/fxcodec/codec/fx_codec_jpeg.o] Error  
1
make[1]: *** Waiting for unfinished jobs....
[build CXX] codemaker/source/javamaker/javamaker.cxx
[build CXX] codemaker/source/javamaker/javaoptions.cxx
[build CXX] codemaker/source/javamaker/classfile.cxx
make: *** [Makefile:268: build] Error 2

I use gcc 7.3.1 20180416.

Any ideas?

Regards
  Dilian