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as you compiled and installed fluidsynth under /usr/local, your qsynth configure line should be like configure --with-fluidsynth=/usr/local, but rather say that you can drop the --with-fluidsynth argument altogether as /usr/local should be in the default system search PATH environment anyway.

if it still can't find the local fluidsynth installation, then it's probably a pkg-config configuration mistake or missing the common library search paths.

try to run `pkg-config --libs fluidsynth` and if it returns nothing, try again right after `export PKG_CONFIG_PATH="/usr/local/lib64:$PKG_CONFIG_PATH";` then qsynth configure step may succeed, hopefully.

hth.
cheers