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If OP is only used to doing web development he may need to install the basic gcc toolchain and bunch of -devel packages.
I needed the following , plus libtool. YMMV
Downloading Packages: (1/6): libvtemm-devel-0.25.0-12.fc26.x86_64.rpm 165 kB/s | 31 kB 00:00 (2/6): pangomm-devel-2.40.1-2.fc26.x86_64.rpm 305 kB/s | 69 kB 00:00 (3/6): libvtemm-0.25.0-12.fc26.x86_64.rpm 95 kB/s | 60 kB 00:00 (4/6): gtkmm24-devel-2.24.5-2.fc26.x86_64.rpm 971 kB/s | 620 kB 00:00 (5/6): atkmm-devel-2.24.2-3.fc26.x86_64.rpm 179 kB/s | 48 kB 00:00 (6/6): glibmm24-devel-2.52.1-1.fc26.x86_64.rpm 804 kB/s | 542 kB 00:00
Geany should not need any of these *mm development packages, they are C++ packages, but Geany is C. Its possible a plugin needs them, but I build most (but not all) plugins and don't have any of these installed (as -dev packages).
Cheers Lex
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