Hi All, Could you please help me to solve the following error? When I try to install monetdb I have the following error: * fatal error: *geos_c.h: No such file or directory #include <geos_c.h> *My steps used to compile monetdb src and to install monetdb are:* a. Environment setup: $ export MonetDB_rel=July2017 $ export MonetDB_ver=11.27.5 $ export MonetDB_base_dir=$HOME/MonetDB-$MonetDB_rel $ export MonetDB_source_dir=$MonetDB_base_dir/MonetDB-$MonetDB_ver $ export MonetDB_build_dir=$MonetDB_base_dir/BUILD $ export MonetDB_prefix_dir=$MonetDB_base_dir $ mkdir $MonetDB_base_dir $ cd $MonetDB_base_dir b. Download the latest version: $ wget https://dev.monetdb.org/downloads/sources/Jul2017-SP1/MonetDB-11.27.5.tar.xz $ tar xf MonetDB-$MonetDB_ver.tar.xz c. Build: $ mkdir $MonetDB_build_dir $ cd $MonetDB_build_dir $ MonetDB_source_dir/configure --prefix=$MonetDB_prefix_dir d. Install: $ make -j 20 (error mentioned above occurs here) $ make -j 20 install Thanks,