[Bug-ddrescue] ddrescue will not compile

[Petr Danecek]

hello,
i am trying to rescue data from my corrupted disk, so i run into your
software. first of all, thank you for your job, i hope i will never need
it again :)

i have problems compiling the sources. as i usually develop in c, not
c++, i am not quite sure how to solve the following problems:

"make -k" gives on output:

------------------------------
g++  -Wall -W -O2 -c -o logbook.o logbook.cc
logbook.cc: In function `const char* <unnamed>::my_fgets(FILE*, int&)':
logbook.cc:57: `isspace' undeclared in namespace `std'
make: *** [logbook.o] Error 1
g++  -Wall -W -O2 -c -o main.o main.cc
main.cc: In function `int main(int, char**)':
main.cc:247: `lseek' undeclared (first use this function)
main.cc:247: (Each undeclared identifier is reported only once for each
   function it appears in.)
make: *** [main.o] Error 1
------------------------------

thanks for your help!
petr danecek