file ‘configure’ has the wrong MD5 checksum checking for gcc... gcc -std=gnu99 checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc -std=gnu99 accepts -g... yes checking for gcc -std=gnu99 option to accept ISO C89... none needed checking how to run the C preprocessor... gcc -std=gnu99 -E checking for gawk... gawk configure: platform type is x86-64_linux configure: library type is static_pic configure: path to example Makefile is /home/paul/ILOG/CPLEX_Studio1210/cplex/examples/x86-64_linux/static_pic/Makefile checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking ilcplex/cplex.h usability... yes checking ilcplex/cplex.h presence... yes checking for ilcplex/cplex.h... yes checking for library containing CPXopenCPLEX... none required configure: creating ./config.status config.status: creating src/Makevars config.status: creating src/config.h gcc -std=gnu99 -I"/usr/share/R/include" -DNDEBUG -DHAVE_CONFIG_H -I/home/paul/ILOG/CPLEX_Studio1210/cplex/include -m64 -fPIC -fno-strict-aliasing -fpic -g -O2 -fdebug-prefix-map=/build/r-base-V28x5H/r-base-3.6.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c check.c -o check.o gcc -std=gnu99 -I"/usr/share/R/include" -DNDEBUG -DHAVE_CONFIG_H -I/home/paul/ILOG/CPLEX_Studio1210/cplex/include -m64 -fPIC -fno-strict-aliasing -fpic -g -O2 -fdebug-prefix-map=/build/r-base-V28x5H/r-base-3.6.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c cplexAPI.c -o cplexAPI.o gcc -std=gnu99 -I"/usr/share/R/include" -DNDEBUG -DHAVE_CONFIG_H -I/home/paul/ILOG/CPLEX_Studio1210/cplex/include -m64 -fPIC -fno-strict-aliasing -fpic -g -O2 -fdebug-prefix-map=/build/r-base-V28x5H/r-base-3.6.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c cplexR.c -o cplexR.o gcc -std=gnu99 -I"/usr/share/R/include" -DNDEBUG -DHAVE_CONFIG_H -I/home/paul/ILOG/CPLEX_Studio1210/cplex/include -m64 -fPIC -fno-strict-aliasing -fpic -g -O2 -fdebug-prefix-map=/build/r-base-V28x5H/r-base-3.6.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c cplex_checkAPI.c -o cplex_checkAPI.o gcc -std=gnu99 -I"/usr/share/R/include" -DNDEBUG -DHAVE_CONFIG_H -I/home/paul/ILOG/CPLEX_Studio1210/cplex/include -m64 -fPIC -fno-strict-aliasing -fpic -g -O2 -fdebug-prefix-map=/build/r-base-V28x5H/r-base-3.6.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c cplex_longparamAPI.c -o cplex_longparamAPI.o gcc -std=gnu99 -I"/usr/share/R/include" -DNDEBUG -DHAVE_CONFIG_H -I/home/paul/ILOG/CPLEX_Studio1210/cplex/include -m64 -fPIC -fno-strict-aliasing -fpic -g -O2 -fdebug-prefix-map=/build/r-base-V28x5H/r-base-3.6.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c init.c -o init.o gcc -std=gnu99 -shared -L/usr/lib/R/lib -Wl,-Bsymbolic-functions -Wl,-z,relro -o cplexAPI.so check.o cplexAPI.o cplexR.o cplex_checkAPI.o cplex_longparamAPI.o init.o -L/home/paul/ILOG/CPLEX_Studio1210/cplex/lib/x86-64_linux/static_pic -lcplex -lm -lpthread -ldl -L/usr/lib/R/lib -lR Error: package or namespace load failed for ‘cplexAPI’ in dyn.load(file, DLLpath = DLLpath, ...): unable to load shared object '/home/paul/R/x86_64-pc-linux-gnu-library/3.6/00LOCK-cplexAPI/00new/cplexAPI/libs/cplexAPI.so': /home/paul/R/x86_64-pc-linux-gnu-library/3.6/00LOCK-cplexAPI/00new/cplexAPI/libs/cplexAPI.so: undefined symbol: CPXcopypartialbase Error: loading failed Execution halted