I downloaded cs50 library for C per the instructions on cs50 docs site.
I then unzip it and run sudo make install but it display the error below:
No superuser binary detected. Are you rooted?
I'm running Termux app on Android, and uses vim as editor.
How do I fix the above? If I decide to root my device will this be solve or is there a workaround to this without having to root my device? TIA.
1. Edit the Makefile
From
DESTDIR ?= /usr/local MANDIR ?= share/man/man3 To
DESTDIR = /data/data/com.termux/files/usr/local MANDIR = /data/data/com.termux/files/usr/share/man/man3 In the Makefile, the question mark equal sign (?=) is for asking if the variable isn't defined. In this case just force it to use the specified path.
2. Build & Install without SUDO
$ make install You'll end up getting an error at end
ldconfig /data/data/com.termux/files/usr/local/lib make: ldconfig: No such file or directory make: *** [Makefile:55: install] Error 127 However the libraries are in the /data/data/com.termux/files/usr/local/lib directory and the man files should be in the right place
$ man get_string should display the CS50 man page for get_string
3. Add missing linking reference
More of a hack but works, as ldconfig doesn't appear to be available in Termux.
In build/lib there should be three files:
$ ls -1 libcs50.a libcs50.so libcs50.so.10.1.10 These three same files should also be in: /data/data/com.termux/files/usr/local/lib
$ cd /data/data/com.termux/files/usr/local/lib $ ls -l .... libcs50.a .... libcs50.so -> libcs50.so.10.1.0 .... libcs50.so.10.1.0 You'll need to add one symbolic link for libcs50.so.10:
$ ln -s libcs50.so.10.1.0 libcs50.so.10 $ ls -l .... libcs50.a .... libcs50.so -> libcs50.so.10.1.0 .... libcs50.so.10 -> libcs50.so.10.1.0 .... libcs50.so.10.1.0 4. Add needed environment variables
$ export LIBRARY_PATH="/data/data/com.termux/files/usr/local/lib" $ export LD_LIBRARY_PATH="/data/data/com.termux/files/usr/local/lib" You'll probably want to add these to your shell environment.
5. Run test C code
$ cd <unzip_directory>/tests realize that the files in tests are using an older CS50 API so
in hackerrank.c needs to be changed from
string s = get_string();
to
string s = get_string("Type here:");
for it to compile correctly. Otherwise you'll get errors like
hackerrank.c:6:16: error: expected expression string s = get_string(); ^ /data/data/com.termux/files/usr/local/include/cs50.h:109:53: note: expanded from macro 'get_string' ...get_string(NULL, __VA_ARGS__) ^ 1 error generated. So once the edit is made. Compile the code.
$ cc -lcs50 hackerrank.c $ ./a.out Type here: <type stuff> hello, <type stuff output> $ Always double check your environment variables with the export command if you are having problems compiling or running.
$ export ... ... declare -x LIBRARY_PATH="/data/data/com.termux/files/usr/local/lib" declare -x LD_LIBRARY_PATH="/data/data/com.termux/files/usr/local/lib" ... ... MANDIR for other man files. If the directory looks fine, you can just copy the CS50 man files from the docs directory. My worry is that the path I have is different from yours (perhaps an older version of Termux). /data/data/com.termux/files/usr/local/include directory has cs50.h file. If not there copy from build/include directory (post step 2). Realize that I'm just following: github.com/cs50/libcs50#troubleshooting but replacing the path with one which will work with Termux. Also double check what you did as typos will break things.